SelectionSave file:File, [flags:Str]
Save selection into file.
The flags argument is a combination of the following options:
- t ("timeless") to create a file without timestamp that can be loaded in any turn
- a selection layer number to save just that layer (default: all)
Since: PCC 1.1.3, PCC2 1.99.13
See also: SelectionLoad, Selection.Layer
