Fixes ambiguity in dllimported inline methods and squelches warnings with GCC/MinGW.  Inlining does not occur in DLL clients unless forced by defining ROCKET_UNSAFE_DLLIMPORT_INLINING
Merge branch 'feature/warningfix-dllimport-dllexport-of-inline-function' into merge-test

* feature/warningfix-dllimport-dllexport-of-inline-function:
  Fixes ambiguity in dllimported inline methods and squelches warnings with GCC/MinGW.  Inlining does not occur in DLL clients unless forced by defining ROCKET_UNSAFE_DLLIMPORT_INLINING