Make it less generic, to avoid clashes.

Closes GH-479.

Closes #477

Destruct automatically, even if leaving the scope due to exception
being thrown.

The list of partitions is cleared automatically.

This replaces the old `dead` flag which was unreliable; it was `false`
if the EventThread was not yet started, which could cause deadlocks in
BlockingCall().

They will be stopped by ~EventThread() when the `Instance` is deleted.

 * "lsinfo" argument is optional
 * "tagtypes disable" arguments are mandatory (typo)

Currently it falls back to system default device (either internal speaker or headphone) when device not found. 
I believe it is a better to fail in this case, to make it better aligned with platforms (such as alsa).