Move all magic numbers to a new beacons config file & various minor fixes.
Add a circlemenu for beacons.
Merge branch 'beacons' of https://github.com/Unvanquished/Unvanquished into beacons
Hide player tag beacons when in sight, make beacons more transparent (from beacons+viech). Remove distance counter.
Optimize beacon entity flags. Use team colors to differ between friendly/enemy beacons.