add a treasure_box node as market stall with texture and nodebox, but without sell/buy function
add additional components for machines and pos systems
clean up namespaces by renaming the mod from 'economy' to 'economies' and set version/modpath outside the economies namespace but to the namespace of the actual submod
init economies_core mod
add an economies.conf.example file, that we can later use to document configuration options
move notifications into economies_core