added initial inventory weapon show
InventoryState segfault fix
Rename `ImageButton` types: BUTTON -> ARROW
New button types
CritterBarterState
Properly include libfalltergeist header directory
Replace relative include of libfalltergeist.h
Merge pull request #92 from smaximov/critter-barter-state

Critter barter state
Merge pull request #93 from smaximov/fix-libfalltergeist-include

Properly include libfalltergeist header directory to the list of directories to be searched for header files
Merge pull request #91 from vvbalashoff/master

added initial inventory weapon show