Base classe for shared named trees
Added meta object for js LocalVoxels object
Modified the Script engine for Local voxel handling
Added example file for LocalVoxels use
Merge branch 'master' of https://github.com/highfidelity/hifi into local_voxels
Added domain and clipboard to the local trees
Made commom string name static const
Added copyTo and pasteFrom to ClipboardScriptingInterface
	- Supports LocalVoxels
Added getVoxelAt for LocalVoxels + handle the case of the domain tree
Merge branch 'master' of https://github.com/highfidelity/hifi into local_voxels
Added import tree to LocalVoxels
Removed copyTo and pasteFrom from ClipboardScriptingInterface (not useful in the end)
Moved LocalVoxels class
Fixed typo
Prevent users from modifying the domain tree with the LocalVoxels interface
Merge branch 'master' of https://github.com/highfidelity/hifi into local_voxels
Added an overlay system for local trees
Added possibility to create a VoxelSystem from an already existing VoxelTree
Some comments and debug messages
Put initialization and deletion of localVoxelSystems on render thread