[Bf-python] Proposed Python API changes for Blender 2.8x

[Campbell Barton]

Hi, we've been collecting various Python API TODO's for Blender 2.8x release

Writing this mail so script authors are aware of the potential changes
and have the opportunity to give some feedback.

https://developer.blender.org/T47811

General comments are fine to reply here,
if you would like to respond to spesific suggestions, replying on the
issue is better.

-- 
- Campbell