FFMPEGMediaPlayer: Add implementation update for FFmpeg version 4.* (Debian 11), 5.* (Debian 12) and 6.* (Current Development trunk)

From here on, libav support has been dropped.

Required FFmpeg libraries to be fully matched by their major runtime- and compiletime-versions are:
- avcodec
- avformat
- avutil
- swresample

Library avdevice is optional and only used for video input devices (camera).

Library avresample has been removed, since FFmpeg dropped it as well in version 6.*
and swresample is preferred for lower versions.

The matching major-versions of each library to the FFmpeg version
is documented within FFMPEGMediaPlayer class API-doc.

Each implementation version uses the non-deprecated FFmpeg code-path
and compilation using matching header files is warning-free.

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