I made some changes so that the removable-media plug is no longer necessary.
Now umu-support can access /media, /mnt, and /run/media, HOWEVER, it cannot access the content. This allows it to function without the Snaps that use it receiving unrestricted access to these locations.
I also added access to the $SNAP_REAL_HOME/umu and $SNAP_REAL_HOME/Steam folders, folders used by UMU in Snap, since its current location is fixed.
This modification is to allow the use of UMU without access to the home plug, should anyone wish to do so.
