Add support for defining error codes and adapt function bodys

[t-b]

• Create errors.h and errors.rc/errors.r

Example:

#define MY_ERROR = "Error Message";

• Output code of functions completely

// string JSON_GetType(variable jsonID, string path)
extern "C" int JSON_GetType(JSON_GetTypeParams *p)
{
  BEGIN_OUTER_CATCH

  LockGuard lock(mutex);
  err = Handler().JSON_GetType(p);

  END_OUTER_CATCH
}