[Suggestion] 80x100 Text Tweakmode

[FavoritoHJS]

After looking at the screenshots, I've noticed that most of them only calculate 80 columns for the whole screen, which means using a text tweakmode is an option!

Here are some notes about this:

• Would allow for a similar colorfulness to Tandy 160x100, but running on standard CGA.
  • Here's an example: https://www.youtube.com/watch?v=V69ykahQi2Q (yes it's older than this project but shhh)
• Might help with performance a tad as you only have to write half of the bytes to VRAM, though snow constraints will probably limit this.
• 25% might be an interesting pattern to investigate -- no duplicate colors, but coarser dither and a different color selection.
• Can be mixed with precomputed ANSI-from-hell images for a minor -- yet significant, especially for text -- image quality upgrade.