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
BF-admins agree to remove header information that isn't useful,
to reduce noise.
- BEGIN/END license blocks
Developers should add non license comments as separate comment blocks.
No need for separator text.
- Contributors
This is often invalid, outdated or misleading
especially when splitting files.
It's more useful to git-blame to find out who has developed the code.
See P901 for script to perform these edits.
