Bug 11431: Add additional sound options

Bug 11431: Add additional sound options

This patch set replaces and extends Koha's current sound options.
This is implemented be removing the existing sound system, and
re-engineering using a table of selector/sound combinations such that
the highest precedence selector that is found in the DOM will trigger
and audio alert. The existing audio behaviors are implemented as a set
of default audio alerts.

Test Plan:
1) Apply this patch set
2) Run updatedatabase.pl
3) Enable the AudioAlerts system preference
4) Test existing sounds
5) Enter the new alerts editor in the admin section
6) Add a new audo alert with the following selector:
    "body:contains('Check in message')",
   choose any sound alert you wish, make sure it's not one of the 3
   sounds already used! Make this selector precedence 1
4) Browse to the checkins page, you should hear the default sound
5) Attempt to return an invalid barcode, you should hear your custom sound!

Signed-off-by: Nick Clemens <nick@quecheelibrary.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>