Colour blindness accessible version

[edwardchalstrey1]

• One of these:
  • [ ] Accessibility mode means you can only click one polity at a time and it turns it a clear colour like black with a thick border Edit this won't help because how would they distinguish the rest of the polities
  • [ ] Update the code such that each Polity also gets assigned a colour-blind friendly colour from DistinctiPy
• [ ] Add a toggle for colour-blind/accessibility mode
• [ ] Ensure legend/colours used by other variables are colour-blind friendly