Remove and delete QUEST_clothdyer_state since it isn't used anywhere.

Remove it from Selim's script.
Add it to clear_vars function.
Katze quest: some punctuation fixes in menus.
Katze quest: subtract 30% of health instead of fixed number when scratched by the cat.
Katze quest: remove player variable KatzeBeenOutside

Use temporary player variable @KatzeNeedsAlone instead with inverted logic.
Add nosaveflag to Katze's cave, so when the variable is reset, you're actually
outside of the cave.
Add KatzeBeenOutside to clear_vars.
Katze quest: use bitmasking to be able to remove the variable LastHiss.

Nibble 0: Progress of quest
Nibble 1: what was saved previously in LastHiss
Add LastHiss to clear_vars

Since the value in LastHiss is only needed to get some hint from Alice,
taking over the value from LastHiss to Nibble 1 of Katze isn't needed.
Katze quest: clear temporary quest state variables before closing the script.