Multiple projects configuration

[praisethemoon]

Currently the library has two different usages:

• C API: Static library
• Lua API: Shared library

The the new project structure should be divided into 3 CMake projects

• Lib: Project source code (static or dynamic library)
• C API: C API interface (static library)
• C API Unit test project (executable)
• Lua API: Lua API interface (not cmake)