To uninstall gir1.2-xplayer-1.0 just follow these instructions.
/linuxmint/sarah/backport///install/index.html GObject introspection data for Xplayer media player a large number of file formats. Linux Mint 18 introspection 1.0.7+sarah
sudo apt-get remove gir1.2-xplayer-1.0
Which will remove just the gir1.2-xplayer-1.0 package itself.
sudo apt-get remove --auto-remove gir1.2-xplayer-1.0
This will remove the gir1.2-xplayer-1.0 package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for gir1.2-xplayer-1.0 then this will work.
sudo apt-get purge gir1.2-xplayer-1.0
Or similarly, like this gir1.2-xplayer-1.0
sudo apt-get purge --auto-remove gir1.2-xplayer-1.0
|Description||GObject introspection data for Xplayer media player a large number of file formats.|