Updated readme (big upcoming changes)
noise uses floats, slightly optimized smoothCurve
The assets directory is now part of the repo
Renamed glutils.hpp => opengl.hpp,
scoped OpenGL 2.1 code into preprocessor directives,
Color doesn't depend on gl:: anymore,
created a config.hpp header in the engine with ZN_ prefixed macros,
renamed gl::initOpenGLExtensions => initExtensions,
checked position and color component count in VertexColorArray,
added drawTexturedRect() to opengl.hpp,
bmfont::Font now uses drawTexturedRect(),
added experimental folder and assets to the repo.