Color selection for painting.
Merge branch 'master' of https://github.com/worklist/hifi

Conflicts:
	interface/src/Application.cpp
	interface/src/Application.h
Added support for "destructive" vs "non-destructive" voxel create
- changed VoxelTree to support destructive and non-destructive mode
- added protocol packet headers to differentiate
- added new UI to switch modes
- default mode now, non-destructive.
Start out with gray, fix coloring smaller portions by (similar to deleting)
breaking up leaf nodes into their components.
Focus tweak; focus isn't returning to the GL widget after closing the color
dialog on OS X.
Just manually request focus.
Merge pull request #312 from ZappoMan/master

support for "destructive" vs "non-destructive" createVoxel()
What matters is the active state, not the focus.
Merge branch 'master' of https://github.com/worklist/hifi

Conflicts:
	interface/src/Application.cpp
Merge pull request #313 from ey6es/master

Voxel painitng with color selection, fix for coloring subvoxels (must break up larger ones).
add a V2 transmitter data packet for new iOS transmitter
Merge pull request #314 from birarda/transmitter

add new packet header for V2 transmitter data