Properly apply dependency injection / inversify

[evktalo]

We have a rather massive constructor for the main engine (KiiGame) class.

Our inversify config covers two classes at the moment as a POC.

We should configure the dependencies with inversify.

Scope:

• configure all default dependencies with inversify
• do the Lätkäzombit-specific configurations/overrides with inversify
• (maybe in scope): implement building Lätkäzombit assets & extra features with inversify instead of accessing KiiGame class instance properties