allow restarting the sound system in the main menu without issuing a full vid_restart
let commands like /follow also report error when for a slot between level.maxclients and MAX_CLIENTS
fix missing Quote() leading to a swallowed error message
remove unnecessary pointer usage for readability
fix accidental boolean as trinary usage
overhaul relay; split from old behavior on new name usage
move all literal env_* names into defines
split out effects out of environment entities in specialied effect categories; this includes also a lot of renaming
add a first version of game_funds for testing