Include Tight decoding optimizations from TurboVNC

- As with the encoder, the decoder now uses the TurboJPEG wrapper, which
  allows it to decode JPEG images directly into the framebuffer.  This
  eliminates a buffer copy (CopyRectangle()) as well as the expensive
  RGB pixel conversion in DecompressJpegRectBPP().  The TurboJPEG
  wrapper performs RGB pixel conversion more optimally, and only when
  necessary (it uses the libjpeg-turbo colorspace extensions when
  available, in order to avoid RGB conversion.)
- The other Tight subencoding types are also now decoded directly into
  the framebuffer, which eliminates buffer copies.
- The Tight decoder now supports the rfbTightNoZlib extension, which
  allows the server to bypass zlib compression when Compression Level 0
  is selected.  The encoder already supports this extension.  Passing
  the data stream through zlib when Compression Level 0 is selected
  needlessly wastes CPU time, since all zlib is doing is copying the
  data internally into its own structures.

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