Add emulator reset

[JimB16]

Added a python function to reset the emulator as talked about in #8
The function works the same way as the Reset function that is available through the GUI.

A short example that resets the emulation every 20 seconds.

from dolphin import event

waittime = 0

while True:
    waittime += 1
    await event.frameadvance()
    if(waittime > 60*20):
        waittime = 0
        print("Reset")
        event.system_reset()

[Felk]

Looks good, thanks! The only issue I have with this is that it's put into the "event" module, but it's not really an event.
If you don't mind I'll still merge this as-is and move it to some other module at a later time. I'm not sure what I'd call that yet though, maybe "emulation"?

[JimB16]

I also wasn't sure in which module I should put the function, so place it wherever it fits the best in your opinion. An "emulation" module is probably a good idea. There might be other GUI functions that I think could be helpful to have available through python.