Improved intensity map visualization

[hkayabilisim]

It is suggested to display intensity maps in a discretized way (Roberto). That can improve readability of the map.

[eminmentese]

I think we must define standard color schemes for each hazard type with predefined thresholds. So that we provide a consistent visualisation for each different hazard case. The hazard modelling team can be asked for that, and based on their feedback, we can implement.

[hkayabilisim]

Color styles are improved (see list below) but not complete. Intensity map will be discretized.

• Color Schemes
  • ui: color standardization (urban atlas) by @hkayabilisim in 79
  • fix: revered color order (red -> high damage) by @hkayabilisim in 82
  • fix: apply custom colours to power network after calculation by @o-z-e-r-e-r in 112
  • ui: revise power node icons by @o-z-e-r-e-r in 108
  • Revert "ui: revise power node icons" by @hkayabilisim in 110
  • Apply again "ui: revise power node icons" by @hkayabilisim in 111