Simplify ModelController

[Corvince]

Not the most urgent of things to do, but I was in the mood to play around with this. Overall, should be much simpler now.

[EwoutH]

I have no idea what any of this code does, but I always like simpler!

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
BoltzmannWealth	small	🔵 -0.1% [-0.6%, +0.5%]	🔵 -0.0% [-0.1%, +0.1%]
BoltzmannWealth	large	🔵 -1.4% [-2.3%, -0.5%]	🔵 -0.1% [-5.0%, +5.9%]
Schelling	small	🔵 -1.1% [-1.4%, -0.9%]	🔵 -0.0% [-0.3%, +0.3%]
Schelling	large	🔵 -1.7% [-2.7%, -0.6%]	🟢 -5.9% [-7.3%, -4.4%]
WolfSheep	small	🔵 -1.0% [-2.4%, +0.4%]	🔵 -1.0% [-1.4%, -0.7%]
WolfSheep	large	🔵 -3.1% [-4.2%, -2.0%]	🟢 -6.8% [-8.8%, -4.8%]
BoidFlockers	small	🔵 +0.6% [-0.8%, +3.0%]	🔵 +0.5% [-0.5%, +1.4%]
BoidFlockers	large	🔵 -1.1% [-3.3%, +0.4%]	🔵 +0.5% [-0.2%, +1.1%]

[rht]

Needs to test if this works on Google Colab.

[rht]

It is indeed simpler, more readable, and hence can be extended by users if they need to fork the component. The only concern is if it works on Google Colab.

[Corvince]

Confirmed that it works in Google Colab!