I say "convert" because it takes the lazy way and essentially just embeds the
wrappers into the backend. It's done this way because I lack the means to check
any changes, even syntactically. This also means the device's ExtraData field
is still needed.
However, this does mean all the backends are now using the new API. Code
related to the old interface can now be removed.
A device will never have 0 latency. OpenAL Soft itself uses a sample buffer
length of UpdateSize*NumUpdates, and during playback will have about
(NumUpdates-1) periods filled, more or less. Without a more accurate
measurement from the playback system, this is better than reporting 0.
This will also allow backends to better synchronize the tracked clock time with
the device output latency, without necessarily needing to lock if the backend
API can allow for it.
