Add import/export/paste model functionality to editModels.js
Add ModelTree::getModelAt
Added working rockPaperScissors.js that works for multiple ACs
Merge branch 'master' of https://github.com/highfidelity/hifi into rockPaperScissors
Fixed crash bug in voxelScriptingInterface
Fixed another crash relating to undo stack. Made script support the
VoxelViewer
Merge branch 'master' of https://github.com/highfidelity/hifi into rockPaperScissors
Script improvements for AC
Merge branch 'master' of git://github.com/highfidelity/hifi into 19783

Conflicts:
	interface/src/scripting/WindowScriptingInterface.cpp
	interface/src/scripting/WindowScriptingInterface.h
Add pasteModels
Add LocalModelsOverlay
Add SendModelsOperation
Implement pasteModels in Clipboard
Add localmodels overlay type
Update and add localModels overlay to editModels.js import/export
Update LocalModelOverlay to work prorperly with translations
Rename buttons in editModels.js
Add ModelTree::findModelsInCube
Fix export models not cancelling correctly
Update exportModels implementation