Toggle hex/dec display

[baileyparker]

When digging through the source I discovered that the assembler allows you to input decimal numbers by simply not prefixing them with $. This is interesting (and not documented...PR to tutorial?), and it made me wonder if it would be helpful to toggle the interface between hex and dec mode.

After thinking about it, I've concluded that it could be useful to be able to toggle (at the least) the A, X, and Y debug output between hex and dec display. It might even be useful to even make this apply to the monitor (say for example, you are writing a program on an array of integers, such as a simple sort).

Thoughts?

[BigEd]

Some disassemblers also show the ascii value where appropriate. This is of course an enhancement: again, if it looks good, works well, and the implementation isn't too twisty, I may merge it from your fork. Rather than a mode, I'd recommend showing all representations (assuming it's not too cluttered an interface) - modes are generally felt to be bad UI.