Combine controlled and uncontrolled signal check into one function

[ElectricityMachine]

If colors are found, return True like normal. If colors are not found, but the white dots of an uncontrolled box are found, return True. If nothing is found, return False. This has the benefit of using one less capture and potentially speeding up uncontrolled signal functions, such as C and F for camera and sidemenu, since it doesn't have to repeat the screengrab. We can return an enum, maybe, for what type of signal box we've found (SIGNAL_DIALOG_CONTROLLED, SIGNAL_DIALOG_UNCONTROLLED, None).

Essentially, it's a better version of 9c135fa.

Once implemented, closes #27.