Blender Git Loki

WIP: Basic modal structure for fill operator

This is the first step to implement a fill operator.

This commit only adds the modal operator but the filling is not implemented yet.

Merge branch 'blender2.8' into greasepencil-object

Cleanup: Use mathlib funcs instead of inlined math

Cleanup: Whitespace

Cleanup: Split GP Sculpt and Weight Paint panels into separate classes

This resolves the need for the draw_header() + empty bl_label
hacks used to try and get this changing dynamically.

Cleanup: Various small issues noticed earlier

* Rename BKE_get_falloff_factor() to BKE_gpencil_multiframe_falloff_calc()
and make it return value instead of passing in a pointer to fill.

* Rename "gso->falloff" to "gso->mf_falloff" to be less ambiguous

* Fix indentation issues in gpencil_brush.c

Fix: Remove leftover debug print

Fix problem when hide collection

When hide the collection the strokes were not hidden.

Merge branch 'blender2.8' into greasepencil-object

Apply scale weight to Offset modifier

This parameter was using the weight in a wrong way. As the offset is a change in the values, the default value change is 0, not 1, so a scale offset of 1 means add 1 to default scale.

Merge branch 'blender2.8' into greasepencil-object

Improve Simplify modifier

- Now it's possible to define number of iterations for fixed mode.
- New mode selector instead of checkboxes
- Changes in UI

Added ID_GD to the OB_DATA_SUPPORT_ID/OB_DATA_SUPPORT_ID_CASE macros

From the looks of things, all object-linked ID types should be
included in here.

While checking on this, I also found a missing case for GP object
in Main.objects.new()

Merge branch 'blender2.8' into greasepencil-object

Change Hook modifier flags

There were some flags that must be removed.

Simplify use of VFX shading groups

The drawing functions was using an additional shading group pointer that it was not used, so it can be removed.

Cleanup: Remove intermediate variable for Wsize

Rename property for full color and fill

Fix typo error using wrong variable

Apply weight only for loc/rot

The weight cannot be used for scale.