Add 'new project' wizard

[raek]

For beginners it would be useful to have a pcbmode command to create a new board directory with .json files all needed sections in place. Perhaps it could contain an outline and an example component as well.

A user shoudl ideally be able to play with the examples in the documentation by just creating a new board with this command and then add the json from the example.

[saardrimer]

I think that this could be fantastic. At the moment I clone an existing board and manually change the names. It works, but it's a process that could be nicely done... perhaps guided.

[saardrimer]

I propose adding a switch:

--new-board <board name>

that will launch a command-line wizard for creating a new project from a template that's part of the repository. This template will contain a simple design with one or two components and shapes.