Update examples to use updated space drawing

[quaquel]

This updates the examples to use the new space drawing functionality properly.

I actually think that sugarscape can now be fully expressed without using a custom space drawing function, but I have left that for now since its convenient to have an example that shows how custom space drawing is possible.

Closes #2432

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
BoltzmannWealth	small	🔴 +11.9% [+9.9%, +13.7%]	🔵 +0.1% [-0.1%, +0.3%]
BoltzmannWealth	large	🔵 +1.6% [+1.1%, +2.3%]	🔴 +7.0% [+6.4%, +7.7%]
Schelling	small	🔵 +0.6% [+0.0%, +1.0%]	🔵 +0.5% [+0.3%, +0.8%]
Schelling	large	🔵 +0.5% [-0.9%, +2.0%]	🔵 +0.8% [-2.5%, +4.1%]
WolfSheep	small	🔵 -1.1% [-1.4%, -0.9%]	🔵 +0.1% [-0.1%, +0.4%]
WolfSheep	large	🔵 -1.0% [-1.9%, -0.2%]	🔵 -3.5% [-5.1%, -1.8%]
BoidFlockers	small	🔵 +2.1% [+1.5%, +2.6%]	🔵 +1.1% [+0.6%, +1.7%]
BoidFlockers	large	🔵 +1.3% [+0.6%, +1.9%]	🔵 +1.7% [+1.0%, +2.5%]

[EwoutH]

Good stuff. Could you add screenshots how they now look?

[quaquel]

The only one that really is changed is virus on a network. The others are mainly cleaning up of code and minor visual tweaks (e.g. set_aspect('equal')) on axes.