added cpuUsage() & E:cpuUsage()
added cpuUsage() & E:cpuUsage()

Returns the average time per tick the server spends running the
specified E2, in seconds (multiply it by 1000000 to get the same value
as is displayed on the E2 overlay).

CaptainPRICE/wire,Grocel/wire,garrysmodlua/wire,thegrb93/wire,mms92/wire,immibis/wiremod,Python1320/wire,bigdogmat/wire,plinkopenguin/wiremod,NezzKryptic/Wire,sammyt291/wire,rafradek/wire,dvdvideo1234/wire,mitterdoo/wire,wiremod/wire,notcake/wire