Add (optional) initial buffering and other improvements
- CLI: the -o option now accepts multiple player ip addresses seperated by a comma. Ignored in serve-only (-x) mode.
- use hashbrown HashMap where possible
- don't blow up memory if the streaming stalls, but discard samples
- add a configurable "up-front" samples buffering before streaming actually starts, it may help to prevent stuttering with some configurations
- fix resizing by using fltk Flex instead of Pack
Windows setup and debug/release binaries in assets.
Linux (Ubuntu 20.04 and derivates and up) in assets
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