Prevent Mac from going idle if VirtualC64 receives game pad events.

[dirkwhoffmann]

"When I play Virtual C64 with a bluetooth controller, Mac starts the screensaver in its setted time (on System Preferences). Obviously no problem using the keyboard."

I found a possible solution here:

https://stackoverflow.com/questions/40408063/replacement-for-deprecated-updatesystemactivity-to-reset-timers-used-to-measur

Executing the following code every time a game device event comes in should do the trick:

var assertionID : IOPMAssertionID = 0
 _ = IOPMAssertionDeclareUserActivity("TeslaWatcher" as CFString, kIOPMUserActiveLocal, &assertionID)

From the Apple docs:

• IOPMAssertionDeclareUserActivity

  Declares that the user is active on the system. This causes the display to power on and postpone display sleep up to the user's display sleep Energy Saver settings.

[dirkwhoffmann]

Presumably fixed in V3.3.1 beta 1:

http://dirkwhoffmann.de/virtualc64/VirtualC64_3.3.1b1.zip

[dirkwhoffmann]

Version 3.3.1 is now available via the update server. Please reopen if the problem occurs again.