Tales of Silta

finally fixed the area effect clouds
added skulkin burrow ability
removed therwin wall noclip
hanks to @RickyPedia, there is now a bossfight music for The Forger
every Mlvl now adds more max ustra 1 -> 2
therwin schizo improvements (entities are chosen randomly)
therwins now have bigger sneak speed 0.3 -> 0.7
therwins are now invisible while sneaking at light lvl =< 10 and are invisible always at ll =< 5