The slides processing scripts have never been updated for 0.9.0 events,
and probably never will be. They're still using older video/audio
processing apis that have poor sync, too. Just remove them.

The playback support files will still be installed, to allow recordings
from old BigBlueButton servers to be copied to a 0.9.0 server.

rap-worker now keeps track of the processing time of a recording; a file called processing_time is generated during the process phase, and this information is added to metadata.xml when the recording is published - this information isn't retrieved by getRecordings because no modification was done on bbb-web to include this information, but at least it's there so the sysadmin can check how long does a recording take to get processed

copied the entire record-and-playback module of BigBlueButton master (pre 0.81) to the v0.8 tag; the only file merged is record-and-playback/core/lib/recordandplayback.rb

only copies the slides text files if they exist; this is to keep the script compatible with old recordings

reverted the code used to process the video for the matterhorn integration; many fixes on the video processing for the new playback format "presentation"; now it's possible to set the output video resolution for the presentation playback - it's VGA by default but could be set to HD

Playback for these shapes' intermediate steps no longer works. The final result is simply shown. This must be fixed.

- Comparison between string and float fix to string.to_f and float.
- Page previously drawn are cleared when new pages are cleared.

It is still buggy, and has some issues that need to be further investigated with not showing the correct page. Also, the code is far from efficient or elegant. This is more of a hacked-together proof-of-concept solution to the problem. The solution has been found, and it is in the works, this is a beta version of what has been created so far. Proceed with caution on this commit. It may have also inadvertently broken other parts of the code as well.