Blender Git Loki

Make Amber a real add-on.

Well, real add-on... since we want to keep it in main repo for now, it
still needs some hacks to 'behave' like a regular add-on. :/

Anyway, it's now removed from startup files, and will live in modules
until we go to master itself.

Also, make it enabled by default in factory startup.

Merge branch 'master' into blender2.8

# Conflicts:
# source/blender/editors/mesh/editmesh_select.c

Fix T53469: Make sure that edges are drawn in the backbuff whenever you are looking for the nearest edge

Caused by rB9f5bf19

Fix for typo in previous commit

Simplify UI-names for B-Bone Ease In/Out settings

For more consistency with the other settings, and increased readability
when the UI is cramped (and it isn't possible to see the whole names).

Version patching fixes for F-Curves (as required for fixes for T48988 and T52009)

* For the T48988 fix (i.e. separate Ease In/Out properties for Bendy Bones
in Edit vs Pose modes), old animation data needed to be patched to use
the new property names. This is needed to partially fix some of the
issues in T53356 (though the Rigify code itself still needs to be patched).

* For the T52009 fix, old files needed to have the frame_start and frame_end
properties on the FModifier (base-class) updated to match that of the
FMod_Stepped type-specific class. This wasn't done in the earlier commit
since it wasn't worth going through all animation data just for the sake
of updating these relatively-rare settings, but since we're doing it anyway
now, it makes sense to include this here.

Change default Drawing brushes

Merge branch 'blender2.8' into asset-engine

Merge branch 'master' into blender2.8

Increase again the maximum value for sculpt brushes

For some operations the old value was too small.

Change default edit line color

The alpha was too low

UI: Add show edit line button to bottom bar

Change default Sculpt brush to PUSH

This default only works for new files, but it doesn't change old files.

Set Ink brush as default

Increase maximum sculpt brush size

UI: Move brush settings to bottom

Increase maximum thickness

Change default pixfactor to 1000

UI: Set panels closed by default

Added BKE_fcurves_main_cb(), a wrapper around BKE_animdata_main_cb to make it easier to apply fixes to all F-Curves in a file