Add components to the grid

[abdbla]

This only means basic components, not the entire component list, but the components need to be able to actually function.

The included components are:

• A beam which can push or pull up to a certain distance.
• A dummy element, which sits on top of the grid.
• An input hex, which should just add some kind of dummy element whenever the space above is empty.
• An output hex, which removes dummy elements on top of it.