Create a cainteoir_supported_formats Gtk+ class.
cainteoir_supported_formats: create a recent filter
cainteoir_supported_formats: add file filters api
Rename the CainteoirFormatType enumeration values.
cainteoir_supported_formats: add an is mimetype supported api
Use the cainteoir_supported_formats API.
cainteoir: recentFilter is not used, so remove it