Include tests listed by Christoph Sprenger

https://github.com/c-sp/game-boy-test-roms lists many test ROMs that we don't yet run:

- [ ] AGE tests: https://github.com/c-sp/age-test-roms
- [ ] Scribbltests: https://github.com/Ashiepaws/scribbltests (another of Ashiepaws' test ROMs)
- [ ] Gambatte test suite: https://github.com/pokemon-speedrunning/gambatte-core/tree/master/test
- [ ] GBMicrotest collection: https://github.com/aappleby/GBMicrotest
- [ ] MBC3 Bank Tester: https://github.com/EricKirschenmann/MBC3-Tester-gb
- [ ] little-things-gb tests: https://github.com/pinobatch/little-things-gb
- [ ] TurtleTests: https://github.com/Powerlated/TurtleTests

It also lists the Wilbert Pol tests, but #28 covers that.