Fix misc warnings in advanced_inv.cpp
Fix misc warnings in addiction.cpp
Fix misc warnings in animation_tiles.cpp
fix Wswitch in computer
fix Wsign warnings. input.h clean now.
fix Wsign warnings. npc.h cleaned
Fix misc warnings in artifact.cpp
fix of Wsign. computer.cpp cleaned.
fix of Wsign-compare in uistate.h and bionics.cpp
fix Wsign-compare in dependency_tree.cpp
Fix Wswitch in colors.cpp
fix Wsign-compare in melee.cpp
Fix Wsign-compare in item.cpp and item_group.cpp
Merge a pile of warning fixes.

Conflicts:
	src/input.h
	src/item_group.cpp
	src/overmap.h