[AD] Audio events

[Trent Gamblin <trent@xxxxxxxxxx>]

I need to get some events from the audio driver. Right now the only
platform where they really should matter (except maybe the route change
event) is on iOS. However I'd like to hear from anyone who knows if and
how these events work on Android or other platforms (phones?). The events
I'm sending now are here, they don't require any data:

ALLEGRO_AUDIO_EVENT_ROUTE_CHANGE - change from speakers to headphones or
   something like that, might need to restart audio
ALLEGRO_AUDIO_EVENT_BEGIN_INTERRUPTION - audio interrupted, for example
   by phone call
ALLEGRO_AUDIO_EVENT_END_INTERRUPTION - phone call or other interrupting
   entity has ended and sound can resume playback

Another thing I want to know is how to use event queues in addons. I looked
at the addons and couldn't see any that used event queues. Do I need to use
user event queues or can I use core queues? The patch I'm using right now
is below but events would be ideal for this.

Trent

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