header (C) fixes
IPRT: Added RTPipeQueryReadable.
vfs: the gunzip stream works, except for some double frees somewhere.
Automated rebranding to Oracle copyright/license strings via filemuncher
iprt: Added RTPipeFromNative, implemented the windows version and added tests.
IPRT: Typo.
scm cleaned up some whitespace.
iprt: Adjustments to RTPipeReadBlocking and RTPipeWriteBlocking. RTPoll and RTProcCreateEx testcases.
iprt/pipe.h++: Adjusted RTPipeWrite[Blocking] behavior wrt to zero byte writes and broken pipes. (darwin will return EPIPE, linux does not.)
RTPipe: Implemented the posix variant.
iprt/pipe.h: Need RTPipeWriteBlocking, some spec adjustments.
iprt/pipe.h: RTPIPE_C_XXX.
iprt/poll.h: quick sketch
iprt/types.h,iprt/pipe.h: Added pipe.h (no code yet) and preparing for polling and RTProcCreateEx.