Install the audio/* plugins under windows and osx
Add a button in the sounds settings to play a test sound
Change button label and made it translatable
Updated Hand image

Looking at the client I saw the cockatrice was still on the card back. I
have now removed it.
Merge pull request #376 from ctrlaltca/oh_my_sounds

Fix sounds under windows and osx (fix #356)
Removed inline logic

Removed inline logic to static variable, slight performance increase.
Merge pull request #381 from poixen/abstractcarddragitemcleanup

Removed inline logic
Merge pull request #377 from poixen/newhandsvg

Updated hand.svg