Blender Git Loki

Add back idnames to the widgetmaps, we could well need to define both
for different transform areas.

Big refactor commit.

* Minor cleanup - propname does not need to be stored anymore.
* Code to support modal widgetmap registration for operators - still
untested, but will be tested soon on sequencer cage widget
* Widgets take parameters to initialize property slots that are used for
feedback or control.
Cage now uses this to feed offset/scale to different properties.
* Initialize common properties during widget registration.

Merge branch 'master' into gooseberry

Code for runtime registration of widgets that should make it possible to
remove and add widgetgroup types from the system.

Start operator that will control sequencer backdrop. Architecture here
still needs a little work so good compatibility with Add-ons can be
ensured.

Make resizer widgets smaller, express them in pixels.

Clamp during rectangle interaction to make sure widget stays big enough
to interact with (also handles negative case). 15 pixels threshold was
chosen.

Correct backdrop fit operator for compositor.

Scale handlers for the rectangle transform working

Merge branch 'master' into gooseberry

Conflicts:
source/blender/windowmanager/WM_api.h
source/blender/windowmanager/intern/wm_event_system.c

Initial Python API for Widgets

Note this is only the initial Python API structure & isn't usable in its current state.

Work by Psy-fi & myself.

minor corrections to last commit

Widget API: remove unused identifier member

also comment some of the code.

Add facemaps panel to the supported cycles panels

Add back an extra paramater to the intersection function to determine
the highlighted part of the widget.

Cleanup leftover code.

Hook up the new DNA data to the node edtior. Now the backdrop supports
2D interaction (scale still pending)

Rename Cage to RectTransform, add DNA for struct that will be used for
interaction with the widget.

Merge branch 'master' into wiggly-widgets

Merge branch 'master' into gooseberry

Get rid of operator, and use facemap name field on shapekey.