- Changed color settings to be configurable per graph.
- Started changing color handling for adding additional graphs.
- Removed unused code (empty functions, etc).
- Removed leftover debug output messages from previous change.
- Fixed and added comments.
- Preparing for YUV graph output.
- Separated collecting color values and threshold detection.
- Preparing for YUV graph output.
- Added generic pixel-color struct.
- Unified graph image variable names (preparing for additional graphs).
- Completely separated colors of individual graphs.
- Added YUV graph (WARNING: values not verified yet).
- Minor cosmetic changes and additional comments.
- Small changes in color graph drawing: Made it easier to read.
- Switched AVPicture buffer handling from manual to ffmpeg's
  routine "avpicture_alloc". This should make it easier to support
  multiple pictures for multiple graphs for easily.
- Fixed using wrong buffer for YUV graph.
- NOTE: known bug = YUV graph is currently only functional with some videos.
- Renamed YUV label to YCbCr.
- Changed shot-detection algorithm to detect changes between full-black
  and full-white, or other RGB-extreme changes (R->G, G->B, ...).
  Tests on real video material revealed no regression, but rather just
  a more reasonable output.
- Added option to enable/disable each color graph separately.
- Disabled creation of YUV graph, because it's still not working
  reliably.