Better rendering control

[zrowny]

There's been a few suggestions on ways to give more artistic control over the rendering output

• Dithering control
  • Dithering amount
  • Dithering type
• Palette control
  • Exclude unwanted palette colors
  • Prevent grey from dithering into tan. The "greys" in the palette are teal-ish, so tan pixels get dithered in to balance that out.
  • Also dark reds are the darkest colors in the RCT2 palette, so dark colors will always turn red.
• Other rendering control
  • Edge darkening effect
    • Improving this effect/giving more control over it
  • Better anti-aliasing support