More letters and privileged fields

Today also a small update, I am working towards the end! I added some more privileged fields. The System control, Display Mode and overall Video Memory.

I also slightly changed the documentation to include the newest instruction. I might have written to the wrong file for that though (will fix that very soon).

And mostly I added new characters, those being all lowercase letters and the period. (See screenshot below)

Next time

I will add new arithmetic instructions because now you can’t actually add one variable to another. And I will handle some more security stuff!