Added roofs, with corresponding fire/dragon behavior
Hacked in multiple world support.
Use number keys to switch
tweaked flammability
worlds are now played consecutively,as the player finds all the coins
Display loading message when loading new worlds
hourglass graphic for loading screen
floor tile xcf
Added maze world
Various tidyups, consistentifications, etc
Re-enable World7
Destroy flammable tiles ignited by dragons.