initial implementation of outer & belted clothing layers
minor tweaks
Fix single arrow pickup and small refactor
Merge remote-tracking branch 'illi-kun/layers' into FrankenMod

Conflicts:
	src/armor_layers.cpp
Moderate game::pickup refactor and output msg tweaking
Capped autoquiver move decrement to 100
Merge remote-tracking branch 'MattAmmann/autoquiver' into FrankenMod