Android Support

[Andru]

New features:
- playing sounds and music(streaming from memory) via OpenAL
- headers and compiled Chipmunk(ARMv5 version with soft-float is quite slow, so I will try to build it for ARMv6 with VFPv2 and test later)
- touch input(but I need some device with real multi-touch to test my code)

But due to some FreePascal incompatibilities with Android it's quite hard to make some progress in low-level parts of this port, e.g. unit cthreads doesn't work so I need to use my own unit with pthreads.