Make piebiten audio buffer size configurable #184
Description
Right now the audio buffer size is fixed, based on the architecture:
- on Windows and Unix the buffer size is 20 ms
- on macOS it is 40 ms
- in the browser the buffer size is 60 ms
But some user environments have problems with such low numbers. For example, the 20 ms Unix buffer size is too low in virtualized environments (vmware).
Add new API, which allow user change the audio buffer size.