Allow variables that have multiple comma separated values also work with a semi-colon separator.

Many variables store several values separated by a comma. For example MS_LEVEL_EDIT_ATTRIBUTE_LIST and MS_LEVEL_SYNC_ATTRIBUTE_LIST can have

settings like:

MS_LEVEL_SYNC_ATTRIBUTE_LIST = OverrideSymbology, ByLevelSymbology, Plot

These should work using a semi-colon as a separator as well as a comma, this would allow us to set values by doing

MS_LEVEL_SYNC_ATTRIBUTE_LIST = OverrideSymbology

MS_LEVEL_SYNC_ATTRIBUTE_LIST > ByLevelSymbology

MS_LEVEL_SYNC_ATTRIBUTE_LIST > Plot

Using this format for setting these values is much easier to read and identify exactly what is being set as well as being easier to document why each value is set with comments.

(Note I'd like this for all variables that use comma separated values, not just these 2 variables)