Changes to Mouse Functionality

Instead of RightDrag +CTRL or +SHIFT for a selection box, this is now done with LeftDrag +CTRL or +SHIFT
Instead of LeftDrag+SHIFT for zooming to box, this is now done with LeftDrag+CTRL+SHIFT or RightDrag+CTRL

RightDrag doesn't do much anymore, but it is being left open to do more with synapse creation in the future.