Game : implemented torch_burn() for spawning the 'AJ_TORCH' particle effect,
and improved that effect.  It is looking pretty nice :-)
Tweak to dungeonTiles.png
Game : properly position the flame effect on the torch.
Engine / TMX loader : partial work for objects which will also add a light
entity, and hence properties like "light" and "color" will apply to the
pending light entity (rather than the original object).
Engine / TMX loader : finished ability to create a light for wall torches.
Test map update.