Transfered Caspar-mav to Git and synchronised with latest code

Transfered latest release (Release 36) from Google Code to GitHub and
synchronised with latest code.
Fixed problems with reverse playback

Turns out, some time ago some problems with reverse playback came to
existance. This fixes them.
Fixed gitrev.bat for better revision tags, fixes in seeking code

Seeking code still needs some work, seeking using +1 and -1 isn't
working exactly
Changed the readme to Markdown syntax, so that it's nicer on github
Beautification of the readme
Still some corrections in readme
Some tiny corrections in the project file
Added a markdown readme file
Fixed the play-head value that the replay_producer returned

Additionally, changed the way images are aligned in the channel_grid
(more like a multi-viewer and increased the size of the channel_grid
channel to 1080p25)
4K support pulled from CasparCG master
Synchronizing with latest master branch of CasparCG
Fixes in the way Caspar Producer reports it's status
Added OSC support to the consumer (still commented out, because consumers aren't supported with OSC in 2.0.4)
Fixed the problem with bad frame number reporting (also broken some features that relied on good frame positioning), and also hopefully fixed the problem with the "dirty frame".
Moved the rendering to another thread.
Decoding moved off from the rendering thread, the producer now has a 3-frame buffer for the rendered frames (this unfortunately means more latency). All rendering is now done on a separate thread, should that thread hang, or cause an exception, the producer will continue to work, just repeating the last available frame.
Removed some unnecessary code
Fixed a bug reported by vimlesh where the producer would return a wrong frame in a paused state.
Tuned chroma subsampling from what was essentially an equivalent of Betacam SP quality to 4:4:4.
Changed the compression ratio, subsampling to 4:2:2 and changed the producer behavior in terms of length and sending an EOF frame to mimic the way the ffmpeg producer works.