feature: `projen clean`

I know there is clobber, but it might not always be desirable as it also does:

hard resets to HEAD of origin

This will not work in cases where:

1. There is no origin yet, as the repo hasn’t been pushed to any remotes (local repo)
2. I have commits that I don’t want to reset to HEAD of origin

In fact, this feels like a mix of concerns that would be better split up and clean is just triggered by clobber.

[eppeters]

Good idea. I just had the following use-case:

1. For some reason (who cares why), I had messed around in my local repo with some build artifacts from previous projen commands.
2. I ran my projen build command.
3. Some error occurred because somehow my projen build step used some of the build outputs as inputs to itself.
4. I ran git clean -dfx (-d includes directory, -f or “force” is required to actually remove files, and -x removes gitignored files in addition to untracked ones).

I think that, since projen is heavily git-based, something like the git command above would make a lot of sense as a generic clean: git clean -dfx

[moltar]

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