Release v4.0.2 · Moonbase59/autocue

Allow recognition of values like -8.33dB (without blank before "dB") in autocue.cue_file.liq as well (it’s already in cue_file). Note: Metadata with units should be used with a blank in between value and unit.
Streamline "sustained endings" code.
Add some diagnostics output to cue_file on the console to easier find and fix problems:
```
Overlay: -23.50 LUFS, Longtail: -38.50 LUFS, Measured end avg: -48.40 LUFS, Drop: 29.09%
Overlay times: 336.50/348.50/0.00 s (normal/sustained/longtail), using: 348.50 s.
Cue out time: 353.00 s
```
Overlay times shown as 0.00 mean a calculation has not been done or wasn’t needed, like longtail above.
Diagnostics are output to stderr, so don’t interfere with the JSON on stdout.
Changed default for "sustained endings" loudness drop from 60.0% to 40.0%. This was a wish from the community and makes for a little tighter/denser song overlap.
Modify to your liking by using cue_file’s -d/--drop parameter or settings.autocue.cue_file.sustained_loudness_drop := 40.0 in Liquidsoap/AzuraCast. A value of 0.0 switches the "sustained endings" feature completely off (behaviour like in older versions).

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