Bdash updated

Boulder Dash was one of the first games to arrive on the Bitbox, but wasn't really advanced enough. I took some time and it's now getting some attention. A new release has been done, with some new features:

• using chiptracker and not sound samples (reducing the game size greatly) ! The original soundtrack was provided nicely by Pulkomandy
• levels ! at last there are more than one level !  now the 1st boulder dash games are available, from a levels.h file describing levels with const strings.
• butterflies  / fireflies : those deadly enemies are now available to kill you. Implementing those were a little tricky since the game was purely tile based (i.e. the whole game state was an array with tile indices) , and the animals need a direction state, I now have a "sprite in tiles" system.
• last level restart : up to now you had basically one life.  (which was very annoying). Now, you restart at the last level you started on. Which means you have basically infinite lives. 
• many small fixes

WIP (non available but shall be available some time)

• proper lives 
• title screens with a little text. This will need a smaller tilemap which will share the tileset and vram of the existing one.
• cool transition effects
• amoeba & magic wall ! 
• score / highscore

See it here : https://github.com/makapuf/bitbox-bdash