lang: Switch to mini-gmp rationals for number representation

lang: Fix CMake dependency on compile.py

lang: Use files for compiling

lang: Replace func with dynamically compiled module ...

I did some tweaking to the style of the generated bytecode but otherwise
this is basically merging func.c in to compile.py. Seems to work for now.

lang: Make app build optional

lang: Split in to library and executable

lang: Make operations thread safe

lang: Add object test code