Support Local Path Install

[FoamyGuy]

This allows local filepaths to be passed to circup install instead of libraries that exist in a bundle.

So it becomes possible to do something like:

circup install synth_tools

which will install the local module at the directory synth_tools/ if it exists (or print an error if not).

That makes it so that circup can be used to install libraries that are not in any bundle but still shared in git repositories or other ways.

@todbot was one person interested in this functionality. If you have the opportunity to test this it's much appreciated.

[FoamyGuy]

I also added tab completion with glob.glob for the install command so that it will suggest existing local files based on the partial match.

[dhalbert]

Thanks! This will be convenient!

[dhalbert]

@todbot I merged, but forgot to ask you if you wanted to test.

[todbot]

@todbot I merged, but forgot to ask you if you wanted to test.

Got to this late, but this is great! Thanks! I think this will make installing larger projects much easier, for situations where we can't distribute a UF2 or have access to bundlefly.