XEMU fix

After releasing, I found that XEMU was behaving slightly different than hardware when I was accessing color RAM that was not equipped.

Since I shouldn't have been doing that, I fixed that issue.

Also, it was pointed out that the disk builder couldn't run from the actual GOG install directory, so the script is hardened a bit to deal with that.

King's Quest 1 release!

Place the mega65-agi.d81 file and the builddisk.py script in the same path.
Ensure that the d64 python module is installed: pip install d64
Run builddisk.py, providing the path to the files you downloaded from GOG.
If you want the disk to autoboot, provide the switch '-a'. Otherwise, SHIFT-RUN/STOP
will start the game.

version-0.5: Implement text parser

Opening several screens of KQ1 are now playable.
You should be able to enter the castle, bow to the king, talk to the king, fall into the moat, examine things, climb a tree, push a rock.

Eventually, you will get a fault when you try and grab an item, or a random number is needed. Working on those next!

version-0.1: Can get KQ1 through the title screen, and wander around several rooms.

Can wander around the first several screens of KQ1. NPCs don't move. No parser.

Initial graphical demo

I'm guaranteeing this WILL break on some AGI games. Also, performance is lacking, but there's lots of things that can be cleaned up.