Add WebWindow widget for scripts
Add grid tools to entity edit tools
Add Grid3DOverlay
Update grid tool html location
Add grid tool menu option
Add Grid3DOverlay to Overlays
Remove unused include
Rename WebWindow to WebWindowClass
Add WindowScriptingInterface::doCreateWebWindow
Merge branch 'master' of github.com:highfidelity/hifi into entity-grid-tool

Conflicts:
	examples/newEditEntities.js
Add back XZ constraining to entity edit tools
Merge pull request #3771 from huffman/entity-grid-tool

Add entity grid tool