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Revert "Revert "Revert "Allow navigating while transforming"""

This reverts commit 2a9cfdac7e126e37afb82e15a131717041f3d2f8.

Revert "Revert "Allow navigating while transforming""

This reverts commit 5e6fdaa07fff907e02b36813ccde0702bad4fb4d.

Revert "Revert "Adjust snap source drawing when adding multiple snap points""

This reverts commit 77df32548b9f377a834b54d0b740a6a51bb2f0a5.

Revert "Revert "Transform: interactive mode for editing a 'Snap Source'""

This reverts commit 805181bffae647a24e939c651da72a08c5c2b7cb.

Pose Library: clarify apply/blend operator names

The old names had "{verb} Pose Library Pose"; they are now named
"{verb} Pose Asset", which is shorter & clearer.

Cleanup: Simplify declarations in C++ header

Using `struct` everywhere is unnecessary in C++, and the typedefs
are also unnecessary.

Fix T93152: Cycles baking multiple selected object to active not working

Revert "Transform: interactive mode for editing a 'Snap Source'"

This reverts commit f19bd637e2c38b8b967944a88609a190b5179439.

Revert "Adjust snap source drawing when adding multiple snap points"

This reverts commit cb3ba68ec4470a170905a2dc9ea64b8fa1f8ace3.

Revert "Allow navigating while transforming"

This reverts commit 1d1855e95f916685fed970904fc37701a4a0e031.

Transform: interactive mode for editing a 'Snap Source'

This patch implements part of what was stated in {T66484}, with respect to `Base Point`.

## Introduction

The snapping feature of the transform tools has a variety of applications:
- Organization of nodes.
- Positioning of frames in precise time units.
- Retopology with snap to face
- Creation of armatures with bone positioning through the snap to volume
- Precise positioning of 3D or 2D objects in the surrounding geometry (CAD modeling)

The goal of this document is to make it more powerful for precision modeling and still supporting the old use cases without extra complexity.
The main topic addressed here is the introduction of a **interactive mode for setting a snap source** (See terminology).

## Terminology

* **Snap Source**: 3d coordinate * we want to snap from. (Currently defined by the `Snap With` options: `Closest`, `Center`, `Median` and `Active`).
* **Snap Target**: 3d coordinate* we want to snap to. (Vertices, Edges, Faces, Grid...)

## Interactive Mode for Editing a Snap Source

Currently the fixed snap point can only be obtained through the `Snap With` options. So it's a little tricky for the user to define a snap source point having so much geometry on an object.
Because of this, the user needs to resort to impractical solutions to get a point in the geometry.
See example of an impractical use:
{F11714181, layout=left, width=960, alt="The user used the cursor (which can be snapped) to choose the snap origin point."}
The user used the cursor (which can be snapped) to choose the snap source point.

While it is possible to work around this current limitation, it is important to reduce the number of steps and allow the user to set a snap source point through an optional interactive mode during a transformation.

The proposed solution is to be able to move the current snap source point through a modal modifier activated with a key (eg. B).
The snap source point can thus "snap" to the elements in the scene (vertex, mid-edge, Lamp, ?) during this mode.
{F9122814, layout=left, width=960, alt="Base Point Snap, example of transform operation via the shortcut (not the tool). After pressing g and the snap base change shortcut (e.g., shift + ctrl) the user set the base point. The base point is then visible until the end of the operation. The z axis constrains the final position."}

## Implementation Details

- The feature will only be available in 3D View.
- The feature will only be available for `Move`, `Rotate` and `Scale` transform modes.
- The snap source editing will be enabled with a single click on the modifier key (B).
- Having a snap point indicated, the new snap origin point will be confirmed with the same buttons that confirms the transformation (but the transformation will not be concluded).
- The snap source editing can be canceled with the same key that activated it (B).
- If the transformation is done with "release_confirm" (common for gizmos), the new feature cannot be enabled.
- During the transformation, when enabling the feature, if the snap option is turned off in the scene, the snap will be forced on throughout the rest of the transformation (unless interactive mode is canceled).
- During a transformation, if no snap target is set for an element in the scene (Vertex, Grid...), the snap targets to geometry Vertex, Edge, Face, Center of Edge and Perpendicular of Edge will be set automatically.
- Snap cannot be turned off during the snap source editing.
- Constraint or similar modification features will not be available during the snap source editing.
- Text input will not be available during the snap source editing.
- When adding multiple snap points (A) the new prone snap source point will be indicated with an "X" drawing.
{F11817267}

Maniphest Tasks: T66484

Differential Revision: https://developer.blender.org/D9415

Adjust snap source drawing when adding multiple snap points

Allow navigating while transforming

This feature has been desired for some time:
- https://rightclickselect.com/p/ui/Tqbbbc/allow-navigating-while-transforming (See comments);
- D1583;
- T37427;

In short, blocking navigation during transform limits the user to move the object only to visible areas within the screen and hinders the allocation of objects within closed meshes.

The node editor is also impaired because some nodes are far between them and the connectors are too small.

The only disadvantage of this patch (as I see it) is the conflict with the existing key map:
MIDDLEMOUSE:
- enable axis constrain in 3D view;

WHEELDOWNMOUSE, WHEELUPMOUSE, PAGEUPKEY, PAGEDOWNKEY:
- change the threshold of the proportional edit;

So the patch solution was to change these keymaps:
- MIDDLEMOUSE to Alt+MIDDLEMOUSE;
- WHEELDOWNMOUSE, WHEELUPMOUSE, PAGEUPKEY, PAGEDOWNKEY to Alt+(corresponding key);

When you use this new keymap for the first time in the proportional edit, it may seem strange due to the custom of using it (both in View2D and View3D).
But quickly the user gets used to it.

Alternatively we can add an option to the user preferences ([] Allow navigating while transforming). (I'm not much fan of this option).

The patch was done on branch2.8. But maybe it's a good idea to apply it to 2.79

Differential Revision: https://developer.blender.org/D2624

Fix Cryptomatte accurate option showing for Cycles, only needed for Eevee

Fix T93082: Cycles baking not handling transparency correctly

For baking, replace transparent BSDF with holdout for baking. This ensure no
objects behind are baked, and that the baked image has alpha.

Cleanup: Use const arguments

UI: Use full word "Start" instead of "Sta"

Differential Revision: https://developer.blender.org/D13098

Merge remote-tracking branch 'origin/blender-v3.0-release'

Pose Library: add conversion button to old poselib UI

Add the "Convert Old Pose Library" operator to the old pose library (in
the Armature properties editor). This makes it more discoverable; before
it only was available in the Action editor.

Merge remote-tracking branch 'origin/blender-v3.0-release'