Lynx and GBA changes (Patreon)

Unfortunatly I didn't have much time the last days, but at least some parts I could tackle:

- Lynx Core code is cleaned up for release, I removed all warnings and intermediate debug code. Need some time to create readme and github project, then it can be released.

- Lynx Core also got one of the last missing features: audio attenuation and panning. Now you can play Klax and hear from which side the stones are coming or which door opens in Xenophobe.

- Fixed two graphical bugs in GBA core that occured in the AGS aging cartridge. From time to time it's great to come back to GBA. It keeps memories fresh.

While I received my Lynx (model 2, quiet good shape), I don't have a flashcard yet, so I may switch to something else for a few weeks until I go for tests on Lynx hardware.

There are quiet some things I would like to do. I'll announce what it could be the next days.