Blender Git Loki

- merge from trunk, up to r59211.

Added a separate floating operator redo panel. Positioning is not complete.

Added drop handler for custom panels to the toolbar. N.B. the drop->copy function has changed everywhere so that bContext and wmEvent can be passed to it.

Remove unused argument

Merging r59315 through r59316 from trunk into soc-2013-depsgraph_mt

Merging r59303 through r59314 from trunk into soc-2013-depsgraph_mt

Merging r59294 through r59302 from trunk into soc-2013-depsgraph_mt

Merge trunk -r59300 into soc-2013-paint

Added drop handler to the menubar. This makes it possible to drag any operator button to the custom menubar.

Makes operator buttons draggable.

Merging r59292 through r59293 from trunk into soc-2013-depsgraph_mt

Merging r59286 through r59291 from trunk into soc-2013-depsgrph_mt

Merging r59258 through r59285 from trunk into soc-2013-depsgraph_mt

Cycles / Sky Model:
* Remove the KernelSunSky struct, which limited us to 1 Sky texture for SVM. Now we can use more than 1 Sky shader, which allows some artificial effects like 2 Sun/Sky's or so.

* New and old model are now working in OSL as well.

Patch by Lukas Tönne, with some small tweaks by me. Thanks!

ToDo:
* Code cleanup!

Merged revision(s) 59185-59246 from trunk/blender into soc-2013-dingto.

Fill tool for projection painting. This will only fill the part of the
model visible on the screen with the brush color

Merge -r59242 into soc-2013-paint

Fix building with blenderplayer

rigidbody: Add convex decomposition collision shape

Uses HACD to break concave meshes into convex chunks and stores them in
a compound shape.

There is a lot of room for optimization. Right now performing convex
decomposition can be very slow for complex meshes.

rigidbody: Fix gimpact shape

Also forgot compound wrapper here