Added drugs

Merged durgz mod into AbyssRP. Converted rp_abysscity_wip3 map file to
use new format. Added sh_drugs. Improved menu system further. Added
RP:DrugShop(). Made an attempt to fix player speeds not changing.
Renamed sh_shipments to sv_shipments. Moved RP:GunShop() into
sh_weapons. Replaced Pedophile with Drug Dealer. Fixed Police Chiefs not
having armor on spawn. Changed Medic to use medic playermodels. Revamped
EntStartup, now works with autorefresh and no longer forces convars.
Removed timers from game.CleanUpMap() override, making it work faster
and less buggy. Fixed small issue in !givecash. Added RP.Constants,
RP:AddConstant(type,name) and RP:GetConstant(type,n) - used for dynamic
constants such as shipment types.
Added content