Audible notifications when coins are sent and received

It would be very useful to have an audible notification when coins are **received** (i.e. the sound of coins dropping on a pile of more coins). In addition, an audible notification when coins are **sent** (like a whoosh sound) would be a nice touch as well. Both can give users a feeling of satisfaction and improve UX for little development cost.

After some searching, I've identified 2 freely usable sound files that are suitable for this purpose:

https://freesound.org/s/211447/
https://freesound.org/s/364638/

Start by reviewing the two freely usable sound files linked in the issue, then locate the existing send and receive transaction flows in the BitShares UI. Done means users hear the appropriate sound after coins are successfully sent or received, without disrupting normal wallet behavior.

Written by the indexing model from the issue text.