Standardise Game Variant Name

[eggman]

Right now searching for Project Reality servers on sites like game-monitor.com requires you filter on "prmm_02" as the game variant.

By that I mean if I want to play a PR server, I filter on game variant "pr" and not "prmm_02" or "prmm_03".

Made a suggestion about install folder, not sure if changing that automagically changes this.. I am unclear what drives this setting, but obviously the sooner this is standardised the better.

egg