Move CGM operators into `operators` subdir.
Shorten operator filenames: remove "Operator".
Add CGM scale operator.
Use new format for operator associations.
Fix and test the CGM scale operator.
Fix per-axis scaling and cleanup operator XML.
Add copy and reflection operators.
Merge topic 'cgm-ops'

7e197640 Add copy and reflection operators.
2bebd10b Fix per-axis scaling and cleanup operator XML.
9e0c218f Fix and test the CGM scale operator.
bdf5b62f Use new format for operator associations.
6c545f4e Add CGM scale operator.
04add001 Shorten operator filenames: remove "Operator".
f6f0da2f Move CGM operators into `operators` subdir.