Keyboard handling

I created IO registers for the Keyboard, with one address for the status and one for the key.

The keys being pressed are detected by swing.

Using this system I created a very simple program to render the last key pressed in the first cell of the text buffer.

Changes

I changed the handling of the load_reg_mem instruction to only read the first byte if it would otherwise read out-of-bounds.

I changed glyph renderer to support more characters

I added a glyph for the comma

Used programs

The keyboard program:

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