Added assets from hydorah-for-linux
Added CMake build system
Added initial init and cleanup code.
Added PhysFS
Restructured init stuff
Handling assets folder for debug builds
Added paths to assets sub folders
Added PHYSFS cleanup
Added SDL2_image to CMake
Added PNG dependency to CMake
Added LibXML2 to CMake
Changed sprites and backgrounds PHYSFS paths
Added /sprites to PHYSFS
Parsing Sprite definitions from XML
Added reference pointers
Added globals header. This should be removed as soon as someone finds a good solution
Added dictionary
Added initial texture stuff
Made init code initialize SDL globals
Made sprites load textures and set up frames