terrain made into an object. Added splice by xcoord function. Added landing pad for initial generation. Added craters on explosion
made explosion be a sprite explosion, added setting
made explosion radius dependent on fuel as well, as in Kerbal Space Program
added crappy logo
fixed small errors in genterrain and terrain render
added checks for rotation, only applies it if valid
Merge pull request #26 from Tritlo/TerrainRefactor

terrain made into an object. Craters! Better explosions!