bind Physical object on one var
refactoring : rename npc class and file
refactoring : follow new name in code
refactoring : prepare folder for future classes
remove chaos
refactoring : split attributes in dedicated classes
returnes NPC is now a dict
refactoring : restore crippled parts
refactoring : cleanup
refactoring : restore earmarks
refactoring : change var name
Close #5
bump to version 0.5