v0.1.0

First release.

• Plays a looping image or video when every real stream on a channel has failed.
• Reads the picture from a path inside the data volume or from an http(s) link, which is
  downloaded and cached; a failed download falls back to the cached copy.
• Attaches the fallback last in each channel's stream order, so Dispatcharr reaches it
  only after every real stream has failed.
• Excludes channels by group name, channel number, or channel name.
• Covers channels added by an M3U refresh, and restarts the fallback by itself when a
  channel starts.
• Serves one MPEG-TS encode to every viewer at once. The encoder starts on the first
  viewer and stops fifteen seconds after the last one leaves.
• Encodes at a constant bitrate with H.264 filler data, so the card fills Dispatcharr's
  one-megabyte start buffer in a fraction of a second rather than minutes, and survives
  the remux the default ffmpeg stream profile performs.
• Matches the picture's own resolution by default, up to 1920x1080.
• Encodes dark gradients without banding and without pulsing between clear and banded: no
  -tune, and a four-second VBV buffer.
• Reclaims its port from a fallback left behind by an earlier run, so Apply recovers on
  its own instead of reporting the port as taken.