Move last 2 API functions to classes and create wrappers
Add __DTS_C_API CPP define to only include the C API when defined and C++ is the compiler it will be included for C compiler
Dont use C++ comments in header file
Merge pull request #72 from gregnietsky/master

Dont include C API in C++ objects wrapper.cpp / cxxapi.cpp are C exports and use the C API