Add more file type imports (css/tssln/ufdata)

Ref

https://discord.com/channels/1042823182987575296/1106708289611370556/1496039601016672376

Apparently CeVIO AI (.css)/VoiSona (.tssln) and ufdata formats are missing though quite well used (especially via UtaFormatix’s app). Maybe add them as well? oO

You can add the other formats as well from other engines :)