decoder/faad: bit_rate==0 is an error
Chrono: rename ToScale() parameter
Chrono: add methods FromScale()
DecoderAPI: pass SignedSongTime to decoder_initialized()
TagHandler: pass SongTime to duration()
db/Count: use std::chrono::duration for the total time

Use milliseconds precision to reduce rounding errors.
db/upnp: use DatabaseStats::Clear()
db/Stats: use std::chrono::duration for the total duration

Use milliseconds precision to reduce rounding errors.