Week 8

Things have done

Fixed segment counting errors in GPencil sample functions. Integrated the modifier with simplify modifier (became another mode in it).
Multiplication modifier now renamed MultiStroke. Fixed previously not working stroke thickness variation function.
Auto update GP strokes when not in LANPR engine.
Moved all the non-drawing related code into editor/lanpr module, refactored naming and code structure to better align with the coding preference of blender. Also added few double version of vector math functions inside BLI math module.
Normalization checkbox in GPencil thickness modifier now allows the use of curve as well.
Fixed erroneous length extending modifier.
Removed freestyle compile brackets regarding to edge/face mark operators. Renamed those into LANPR to keep them. Also added them back into the UI when LANPR is in use.
Slight changes with GPU shader and APIs.
Decided which functions are needed to merge in the first stage. The development won't focus on other stuff outside this stage's target. Good ideas will be added after this stage is completed solid. To see what we are planning to merge, check this document. We are getting so close!
The GP team and me are working on a more workflow-oriented UI, which is of better consistency with current Blender UI. Will be implemented soon.

UI should be mostly done with maybe only few slight changes in near the future.
Vertex group support for LANPR oriented GP modifiers.
Fix the stroke deform/generation order problem that one of my GP modifier induced. Should be quick as Antonioya already added frame argument in the deform callback.
Still unable to fix that slight GPU memory leak somewhere in my code. Needs investigation.
A Usable SVG API.