UI: Remove "Enable physics for:" text in physics properties

The "Enable physics for:" text makes no semantic sense- i.e.
"Enable physics for Fluid". Additionally, the leading text is just not
necessary, this section is just as clear without it.

Differential Revision: https://developer.blender.org/D10537

UI: Clean up labels and descriptions: "Draw" to "Display"

In Blender, we used to use the term 'draw' to refer to information
displayed to the user. For version 2.80, it was decided to change these
instances to 'display' instead. This was to avoid the ambiguity between
end-user drawing tools and display options.

From the Oxford English Dictionary:
- Draw: produce (a picture or diagram) by making lines and marks on
paper with a pencil, pen, etc.
- Display: show (data or an image) on a computer, television, or
other screen.

Therefore, we should use draw when referring to drawing tools for
making marks, but use display when referring to information
shown/displayed to the user. From a user POV, the computer displays
certain information, whereas the user draws a mark.

Apparently this change was not implemented consistently, so this patch
changes all remaining relevant instances of "draw".

Differential Revision: https://developer.blender.org/D10551

UI: Clean up labels and descriptions: "Draw" to "Display"

In Blender, we used to use the term 'draw' to refer to information
displayed to the user. For version 2.80, it was decided to change these
instances to 'display' instead. This was to avoid the ambiguity between
end-user drawing tools and display options.

From the Oxford English Dictionary:
- Draw: produce (a picture or diagram) by making lines and marks on
paper with a pencil, pen, etc.
- Display: show (data or an image) on a computer, television, or
other screen.

Therefore, we should use draw when referring to drawing tools for
making marks, but use display when referring to information
shown/displayed to the user. From a user POV, the computer displays
certain information, whereas the user draws a mark.

Apparently this change was not implemented consistently, so this patch
changes all remaining relevant instances of "draw".

Differential Revision: https://developer.blender.org/D10551

Fix T84911: Add Primitive and IC keymap - 3d navigation conflict

Ref D10176

UI: improve categorization in Grease Pencil Layers sub-panels

The "Layers" panel for Grease Pencil objects uses sub-panels to organize
their properties in categories. Currently, this isn't so clear.
This patch cleans up these sub-panels with clearer categorization.

Reviewed By: #grease_pencil, antoniov, Blendify, HooglyBoogly

Ref D10184

UI: object context menu tweaks for consistency

Currently, the object context menu includes some inconsistencies
between object types. This is a small patch that fixes these.

- Adds the same ability to Join and Set Origin
to all supported object types.
- Adds Set Active Camera for cameras.
- Adds Adjust Stroke Width for GP Objects.
- Adds Trace Image to Grease Pencil for Image Empties.

Reviewed By: #grease_pencil

Ref D10144

UI: tweak object context menu labels

A number of naming changes for consistency and clarity

- Use 'Adjust...' for all entries that adjust properties
rather than being normal operators.
- Follow naming conventions (ie Draw -> Display etc).
- Less naming ambiguity and more correctness and consistency.

Part of D10144

UI: move 'Trace Image to Grease Pencil' to 'Convert' sub-menu

This operator is very specific, and may not warrant being placed in
such a prominent place. Move it together with other convert operators.

Ref D10188

Fix T77051: IC keymap hotkey conflict in mode switching with GP object

Constraints UI: Add separator after the X to match modifiers