release v0.20.23

The compile-time calculation for `factor` overflows because `1<<31`
cannot be represented by `int`.  By casting to `uintmax_t` first, we
can avoid this overflow.

Closes #380

This assertion currently fails for S32 due to integer overflow (#380).

The `bool` return value isn't used anymore, so we can just return the
parsed object instead of passing it as an output parameter.

This emits the event even if PlayerControl::Play() is used to replay
the current song, which emits the missing "player" idle event.

Closes #381