Fixed missing rename of function call in auth/core.lua
Fixed syntax error in gamemod.lua - still not doing what is expected :(
Major cleanup of player_vars:
  - no more need for nil'ing them in modules on disconnect
  - player_set_session_var removed, can be replaced by player_vars
  - only set metatable on init, not on every call
Fixed compile.sh and allow setting THREADS from outside
Merged hopmod