Fixed autorefresh

Autorefresh can now refresh everything, including modules and chat
command plugins,which fixes #24. Changed all mentions of 'money' to
cash, which resolves #34. Evolve commands are now grabbed when doing
chat autocompletion, which fixes #43. Renamed rp_ammobox to rp_itembox.
Moved GUI from last commit into it's proper location now autorefresh
works fully. Modified !shop to call a hook so multiple classes can use
it, still WIP. Added model and displaymodel to weapons in sh_weapons.
Updated gun dealer GUI, 'weapons' tab now fully functional. Modified
!setprice so there is no maximum value, may re-add in future.