Synchronized popups
Moved unsync'ed GUI code from AudioManager, to the main thread. Data sync between both threads is managed by SDL events.
Netplay popup has been modified too, but still disabled. Should stop random crashes due to Music popup.
Moved unsync'ed GUI code from AudioManager, to the main thread. Data sync between both threads is managed by SDL events.
Netplay popup has been modified too, but still disabled. Should stop random crashes due to Music popup.