Design and implement basic microbe AI

[bkloster]

Racing around with the player microbe is fun. For about 5 seconds. Let's add a little more variety and populate the world with more microbes.

To make them do something, we need some AI. For the moment, I think it would be enough to let the AI microbes chase after energy floating in the environment. If their energy storages are full, they should swim around idly until the storage is down to, say, 80%. Or they could chase and harass the player by bumping into him.

[jjonj]

I'll start looking at this. I'm thinking of starting with a MicrobeAIComponent and associated system with some basic functionality. A completely generic AIComponent could be considered but that would be difficult without lambdas which would complicate serialization.
I'll employ the spawning system for spawning AI microbes.

[bkloster]

A specialized AI for microbes is definitely the way to go for now. Also have a look at this excellent (and tasty) article.

[jjonj]

Closed with #81