Fixed|libgui: Vertex builder position accuracy issue in makeRing

Make sure the ring starts and ends at the exact same position.
Fixed|Doom|Doom64: Incorrect cvar value range for 'player-color'
Client: Don't warn about failed auto-selection of game
Fixed|Heretic: Removed invalid cvar 'player-weapon-order8'

Heretic only has eight weapons (0...7).