Code review comment for lp://staging/~muktupavels/compiz/remove-mate-integration

And there are almost no code changes compared to GNOME integration, it is mostly renaming functions from GNOME* to MATE*, removing some Unity-specific code, and removing the gschema.

Also it misses some fixes like the recent s/fullscreen/fullscreen-flash/ fix.

If someone wants to reintroduce this in the future, it is better to reuse existing code rather than duplicate it.