Use drag-only keyamp to adjust gizmos which use drag motion
to change a value. By default gizmos still activate on press.
This allows for left click select to be used with transform
without the gizmos getting in the way.
Even though this isn't necessary for right click select
it allows click events to pass through and be used by tools
which can be useful.
Resolves T63996
The popover for displaying gizmos now has options for
empty, light & camera gizmos.
Transform toggles are now checkboxes, which has the advantage that it's
more obvious they can be mixed however changing from one to another now
uses 3x clicks instead of a single click-drag action.
We might need a faster way to switch between transform types.
