Render path

[ll-nick]

Here's a basic implementation of how we could render the planned path. This is what it looks like:

A couple of things I would like to discuss before finalizing this PR:

• First of all: Do we even want something like that?
• If so, should we change the Command up somehow to give us the "absolute path"? The implementation right now kind of duplicates the toAbsolutePath function to keep the interfaces clean.
• Is it worth the time and effort to not render the full tile, i.e. just the center line of the path? It certainly would look nicer but makes things more complicated because you have to check if the path is horizontal/vertical (relatively easy) and whether it has corners.

@orzechow Let's discuss this one later.

[ll-nick]

• Would be nice to toggle this on and off with a keybinding.
• Leave command as is and pass pacman position (like it is implemented right now)
• Move toAbsolutePath into Path class or similar

[ll-nick]

Ok, should be good to go now. This is now the naive approach without boost or pretty paths but it is toggleable via p (default is off) and minimally invasive.

We should print the keybindings somewhere, but since that is a separate issue (#57 ) I would merge this one regardless.