Adding a "fast mode" option proposal

[fstark]

(Not sure what is the best way to discuss potential features additions, so using issues)

I am changing napple1 to fit my use case (development of Apple1 software, bundling of software into ROMs). Using napple1 because it is easier than mame for testing stuff (unless I need a debugger) and have that great dump core feature.

I don't need my changes to be merged back, but if they are useful, I am fine spending time to do them properly if they fit napple1's roadmap. I know that more code is more stuff to maintain.

I added a "fast mode" to my version: Pressing "Shift-F" alternates between fast and slow mode. In fast mode we don't emulate the 16ms delay of the Apple1 when displaying data. It makes entering data via autotyping or examining memory in wozmon a breeze.