Blender Git Loki

Eevee: Add Irradiance Grid support

Early implementation. Slow and still has quality
3 ways of storing irradiance:
- Spherical Harmonics: Have problem with directionnal lighting.
- HL2 diffuse cube: Very low resolution but smooth transitions.
- Diffuse cube: High storage requirement.

Also include some name change.

Probe: Add grid probe parameters.

fix for distortion, should avoid snapping back of geometry

PYAPI: Fix mathutils doc structure

Merge branch 'master' into blender2.8

Make whole ID copying code use const source pointer.

Noisy change, but safe, and better do it sooner than later if we are to
rework copying code. Also, previous commit shows this *is* useful to
catch some mistakes.

Fix three obvious mistakes in brush/mask/cachefile ID copying.

They were modifying some source ID prop, instead of copied version of
it... Found while making all source of ID copying const. ;)

PYAPI: fix documention structure of bpy.app

Don't use undo for manipulator tweak operator

This causes problems when tweaking an operator

Fix divide by zero dragging the arrow

Cleanup: remove redundant access function

setting solver res here is obsolete

no need to set this explicitly. solver only threw expection when loading blend files created with vanilla blender. versioning support will handle this in the future.

Fix missing toctree for bmesh submodules

added support for particle velocities

now saving and loading particle velocities from uni files

refactor of automerge shared vertex handling function

Fix problem of stroke thickness when zoom

The stroke thickness was not working fine in Camera view.

The credits for this fix go to Clemnt Foucault and Luca Rood, thanks for the help!

PYAPI: Fix freestyle submodules without tocrees

Fixes 6 compile warnings
Follow up on rBf87ca5f1c314f67353b6111d3647aef159dc07c6

fix attempt for uncontrolled "snapping" when using keep distort

Cleanup: use consistent abbreviation for manipulator vars

Manipulator Properties

- Add a different kind of properties that use function callbacks
instead of RNA.
Needed for situations when there isn't 1:1 correspondence
between the manipulator's position and the internal value.
- Move manipulator properties into their own file.