Add build.py for easier cross-platform building.

[ZCG-coder]

build.py attempts to solve problems on platforms where CMake is unavailable. It manually calls the compiler, but uses a totally different approach than CMake - the binary files are stored after compilation, and it will NEVER build a file twice.

Tasks:

• Add a basic build system.
• Automatically determine the compiler, linker, archiver, etc.
• Ability to determine whether a target needs updating.
• Ability to show percentage.
• Add documentation.
• Add tests.
• Modify setup.py to use the new build system.
• Build the entire library using the new build system.