Deprecate 22,500 Hz sampling rate and add 22,050 Hz instead

[hagenw]

As mentioned at #466 (comment), the sampling rate of 22,500 Hz we provide at the moment as a flavor seems to be a bug, as usually people are using 22,050 Hz, compare https://github.com/audiojs/sample-rate and CSS10 as an example dataset stored in 22,050 Hz.

A way forward would be to deprecate 22,500 Hz for removal, and adding 22,050 Hz as new sampling rate.