Extended RTOnce with termination cleanups. (Changes existing structures and functions.)
doxygen nits.
*: spelling fixes, thanks Timeless!
Automated rebranding to Oracle copyright/license strings via filemuncher
iprt/runtime-loader.h: doxygen, hunarian.
Runtime/runtime-loader: use RTOnce again
Runtime: generalise the code used to load libdbus at runtime to a template for loading shared libraries