Allow creating an entity without any components

[GGAlanSmithee]

Allow for creating an entity without components

Background

At the moment, we use the components property to determine wether an entity is alive or not, so creating an entity without any components is not possible.

Not sure I want to do this:

Pros:

• An entity does not have to have components (is this even meaningful?)

Cons

• Major re-write
• More internal state