[Bf-python] D163 - Freestyle Python API reorganization in line with the bpy modules

[Tamito KAJIYAMA]

Hi,

I would like to kindly ask for code review of the following patch
for Freestyle in Blender.

Freestyle Python API reorganization in line with the bpy modules
https://developer.blender.org/D163

Thank you,

-- 
KAJIYAMA, Tamito <rd6t-kjym at asahi-net.or.jp>