Blender Git Loki

Cleanup code

Fix draw back error due z-depth precission

The value 1.0 makes the image disappear.

Merge branch 'blender2.8' into greasepencil-object

Fix problem when increase viewport qualitty

The reason of the problem was the precission of the background buffer. The original value was not enough when viewport qualitty was > 0.1

Cleanup unused extern definition

This was part of old VFX modifiers.

Fix again the pointer name for textures

UI: Rename Grease Pencil Simplify Panel

Fix merge errors

Merge branch 'blender2.8' into greasepencil-object

Conflicts:
release/datafiles/userdef/userdef_default_theme.c
release/scripts/startup/bl_ui/properties_scene.py
source/blender/editors/gpencil/drawgpencil.c
source/blender/editors/gpencil/gpencil_brush.c
source/blender/editors/gpencil/gpencil_paint.c

Move GPD runtime fields to runtime struct

Annotations: Set better default name for new annotation layers

Note: Many of the add layer operators still need tweaks,
but this is a good start for the main ones.

Annotations: Restore color selector per layer

This shows up in the layer list, making it possible to quickly change it
inline, and to see what color the strokes in the layer are using.

GP/Annotations: Provide usage hints about the "Poly" tool

Annotations: Don't respect the "on back" option

This is too complicated for an annotation tool

Remove "Continuous Drawing" flag/mode

* GP Object doesn't need this as it has a proper "Draw Mode"

* For Annotations, it just got in the way and was a confusing
modal+blocking nuissance that randomly activates when you just
want to draw a quick line

Annotations Fix: "Freehand" mode now works

Was over-zealous when removing code from the drawing operator
to remove all the non-essential additions here.

Now annotations work in some of the 2D views:
* Nodes/Image Editor are confirmed to work
* Sequencer Preview needs further work
* Movie Clip editor works

Fix stabilizer cursor after annotations

The cursor was drawn to wrong position after use annotations.

Cleanup: Change "Drawing Tools" panel to use the annotation tools, not old GP drawing operator

This panel is going away soon, to be replaced by the active tools system.
But in the meantime, we need to stop using this old panel as it will
cause crashes when used.

Fix: Errors in console when using annotations in viewport

Was caused by a missing poll callback for a GP object panel

Annotations: Put in place basic building blocks for Annoations UI (WIP)

This is still a rough draft, just restoring all the essential bits and
pieces to have a workable system.