Add experimental darkplaces quake

Just darkplaces-rpi with shareware game file from id software. Runs nice if you run RetroPie/roms/ports/darkplacesquake.sh from console.  If it is run from emulationstation there are issues. Controls are different and the menu cannot be used. I don't know why, but there seems to be a problem between emulationstation2 and SDL/SDL2 games/emulators like mupen64plus-rpi and darkplaces quake.

Workaround: Run dark places as root atm (line 44).
darkplaces: minor improvements

-Set right config file permissions.
-Unzip without asking.
-Move game files from /roms/ports/id1 to more clear /roms/ports/quake/id1.
Merge pull request #491 from gizmo98/patch-1

Add experimental darkplaces quake