Initial version of functional test

[mre]

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This is an attempt to fix #12. It was copied almost verbatim from other test suites.

Right now, it doesn't work, because our little CPU runs out of memory. I have yet to find out, how other emulators deal with this. Theoretically, the amount of memory should be the same... 🤔

@senden9, @thejpster any ideas on this?

[senden9]

Before i opened #12 i already tried to to implement a few test cases. They failed also for me. I did not research why this happens. Maybe some investigation is necessary to find out what the other emulators do.