Blender Git Loki

GPencil: Refactor: Improve stroke color mixing support

This is a more simple implementation. Blending is done in a way that it
supports the stencil functionallity out of the box. It is compatible with
vertex paint, stroke material color and texture color without exclusivity.

UI need to be reworked to remove the stencil option.

GPencil: Refactor: Add Dots & Square drawing type

Also add vertex color opacity

GPencil: Refactor: Add UV / Texture support to strokes

GPencil: Change order of the UI parameters for materials

GPencil: Change step for Mix factors

The old step value was too high.

Merge branch 'greasepencil-object' into greasepencil-refactor

Merge branch 'master' into greasepencil-object

GPencil: Remove Checker Fill mode

This mode is redundant with textures and only adds complexity for something that can be solved easily using a checker texture.

Also, old files are patched as SOLID fill.

Gpencil: Cleanup unused code

Cleanup: GPencil: Use different random values for random effects

Cleanup: GPencil: Rework code for clarity and remove compiler warnings

This should not change anythign

GPU: VertexFormat: Fix assert off by one

GPencil: Refactor: Add basic vertex color support

GPencil: Fix error in Transform Fill

This code was damaged during a merge.

GPencil: Fix TRansform Fill UV error

During a merge, we removed this by error.

GPencil: Rename "Boxes" mode to "Squares"

GPencil: Remove ol UV data from triangle struct

GPencil: Refactor: Put fill uvs into bGPDspoint

This is not the best place but that's a temporary solution.

GPencil: Refactor: Add support for fill textures

GPencil: Refactor: Rename gpencil_data.c to gpencil_draw_data.c

This is to avoid confusion with the already existing gpencil_data.c.