Gentle sound for successful interactions

[totycro]

As a counterpart to the error sound, there should be a gentle, confirming sound, signaling successful operations (without being obstrusive). The build sound is an example of that, but the one this ticket is concerned with is for interactions

Example usages:

* trade tab (transfers of resources from ship to own or allied player)

> Link to originally reported Trac ticket <

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[kinshuksunil]

will get back with some samples, soon. Feedback will be useful then.