Update documentation for Mixin base class.
Don't try importing Inventory here.
Don't assume Status and Inventory for the base actor class.
Change retrieve_components to get_components.
Properly handle when components are not found.
Give the player Equipment and Status.
Default to initializing just with Component owner.
Make BodyPlan: into Body(Component): and remove useless initializers.
Put some comments in this (messy!) file.