Update entitySelectionTools to use camera position/orientation instead of avatar
Fix right/left stretch entity tool
Fix entity tools focus not always using latest entity position
Merge branch 'master' of git://github.com/highfidelity/hifi into entity-tools-new
Update entity edit tools

Move editing functions into "tool" objects which contain onBegin,
onMove, and onEnd functions.
Add multi-selection
Add local and world editing modes
Fix XZ tool
Merge remote-tracking branch 'upstream/master' into entity-tools-multi-selection
Merge pull request #3631 from huffman/entity-tools-multi-selection

Entity Tool Updates
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels