lavu: add escape API
The escape API will be useful to perform escaping programmatically, which is required when crafting argument strings, and will be used for context printing as well. This is based on the ffescape tool code, with a few extensions and fixes.
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- doc/APIchanges 3 additions, 0 deletionsdoc/APIchanges
- libavutil/avstring.c 18 additions, 0 deletionslibavutil/avstring.c
- libavutil/avstring.h 42 additions, 0 deletionslibavutil/avstring.h
- libavutil/bprint.c 45 additions, 0 deletionslibavutil/bprint.c
- libavutil/bprint.h 17 additions, 0 deletionslibavutil/bprint.h
- libavutil/version.h 2 additions, 2 deletionslibavutil/version.h
- tools/ffescape.c 20 additions, 73 deletionstools/ffescape.c
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