This enables the configuration to specify aliases for compatibility with other
configurations.

When a colorspace name is saved in a.blend, that is the alias of a colorspace
in the current configuration, it will show the main colorspace from the
configuration in the user interface and Python API instead.

Loading & saving the .blend file does not make any changes to the stored name,
so as to not make hidden modifications. Only when setting the property again
will the alias name be overwritten by the main colorspace name.

Fixes T96049