fixed audio.Set/GetListener* functions not working at all

added source:SetReferenceDistance(num)
added num source:GetReferenceDistance()
added source:SetRolloffFactor(num)
added num source:GetRolloffFactor()
added source:Pause()
lots of work on the love2d audio wrapper
debug.stepin() rewrite
curses console is by default bigger
better history scrolling
fixed "%" not showing properly
init.lua is now reloadable (by restarting the whole engine)
removed redundant code