Blender Git Loki

Merge branch 'blender2.8' into greasepencil-object

New rounded end caps

Now the stroke ends are rounded to get more artistic look.

allow rigidbody being a forcefield effector too

this was disabled intentionally for some unknown reason

Merge branch 'blender2.8' into greasepencil-object

Fix multiframe error when lock layer

There was a segment fault if the some layer was locked and enable multiframe edit / sculpt or weight paint.

The shading group must be created because is used in multiedit lines.

fix, threshold and cluster threshold application was swapped

WIP: Experimental Offscreen buffer for fill

Simple implementation of stroke drawing to texture

Possible solution for workspace mode

Basically implements the proposal made in [[https://developer.blender.org/T53389#474275|this comment]].
Important to note: This implementation keeps the mode stored in the object, the workspace takes care for setting it though.
Even if we decide to move the mode out of the object, most code here would still be valid. This is just a much more feasible approach that may suit our needs already.

The basic rule for setting the workspace mode is: The last active mode that is not object-mode (`OB_MODE_OBJECT`) becomes the workspace mode. Therefore the workspace mode must never be `OB_MODE_OBJECT`
By default new workspace use edit-mode as workspace mode.

Now, some parts of the design I'm not sure yet. Mainly:
* The implementation makes the workspace remember if the workspace mode or `OB_MODE_OBJECT` is active. Pressing TAB toggles between them. However the workspace doesn't try to keep the workspace mode active while only using `OB_MODE_OBJECT` as fall-back or when the user explicitly sets it. This differes from what I wrote in [[https://developer.blender.org/T53389#474275|mentioned comment]]. Maybe that's better maybe not.
* If the workspace mode isn't compatible with the currently active object, pressing TAB does nothing. In theory this may make sense, in practice it might be quite annoying though.

I'm not submitting that for code review really. Just for feedback on the general design approach and the discussion points mentioned above.

Subscribers: sergey, dfelinto

Differential Revision: https://developer.blender.org/D2965

exposed meshisland constraints and modifier vertex groups to python

this was done to enable a new feature in the addon, the cluster editor.

refactored python object desctruction setup

no need to specify individual variables anymore - deletion now based on id

updated manta pp files

Fix merge errors

There was a problem with struct byte alignment.

Merge branch 'blender2.8' into greasepencil-object

Conflicts:
source/blender/blenloader/intern/versioning_280.c
source/blender/draw/intern/draw_cache_impl.h
source/blender/makesdna/DNA_scene_types.h

Delete with Border select in paint mode

This commit is similar to Lasso, but for border select.

New Eraser with Lasso select

When you are in paint mode, if press Ctrl+Alt and select with lasso tool, the points are removed.

This is a request of the Hero team after been working in cleanup process. The Lasso delete allows to remove very fast areas of the drawing.

Cleanup: Function to avoid code duplication

Add Erase stroke with Ctrl key

If press Ctrl over a stroke while using the eraser, the stroke is fully deleted, not point by point

Initial implementation of the workspace mode for TAB toggling

Merge branch 'blender2.8' into asset-engine

Merge remote-tracking branch 'origin' into soc-2017-sculpting_brush