removed ode for now
Added collision, command, hero, va_list

various other modifications.
added JSON constructor to bounding box
added alarm class to trigger sound effects on a timer
removed alarm, extended functionality of sound to allow loop, pause, resume, stop
added movement to Hero
removed mixer, created chunk and music, sound now controls the mixing of channels for chunks
tidied some includes
made the handling of exceptions in some constructors more rigorous
added sdl initialisation to event