mint-arena: Rename some references of client to player (VM API)
mint-arena: Rename clientNums to playerNums in snapshot_t
mint-arena: Rename Com_LocalClient* to Com_LocalPlayer*
mint-arena: Rename a lot of client to player in cgame/ui
mint-arena: Rename cglc_t to localPlayer_t
mint-arena: Remove (unused) structure powerupInfo_t
mint-arena: Rename playerInfo_t to uiPlayerInfo_t
mint-arena: Rename clientinfo to playerinfo
mint-arena: Rename tons of references to client to player
mint-arena: Remove unused function CG_PlayerNumFromName
mint-arena: Rename more client to player in game
mint-arena: Rename more client references to player
mint-arena: Remove unused incomplete global ranking system code

The ranking system calls, commands, and cvars don't exist in latest Q3 release.
Appearently it was removed when Team Arena was released (Q3 1.27g).