GitLab

* always render normal BG/OBJ graphics (even if they're not getting displayed, they can still be fed to the capture unit)
* fix 3D viewport calculation
* keep track of the clearbuffer attributes before VBlank

* more versatile and better clipping code

* map some I/O ports

* support for appropriate output modes

* louder sound
* misc fixes

* volume, volume div, panning, master volume

preliminary audio. only supports PSG (and handles all channels as such). drops out every once in a while.

* feed system time into RTC
* start laying base for sound

* proper setting for booting directly or from BIOS
* fix shit, again

fix extra shit.

screen scaling that preserves aspect ratio.
touchscreen takes scaling into account.

* working-ish run/pause/reset
* proper closing/cleanup
* ability to run BIOS alone

included WinMain() for compatiblity.