main.go: Custom `Required()` for `--project` argument

As far as I've been able to figure out, Kingpin doesn't have a mechanism
for dependent arguments or conditional requireds. Thus there's no way to
say "--position is only required if --write-config isn't passed".

In that case, write our own "required" check, to enforce the presence of
"--project" only if "--write-config" isn't passed. We duplicate the
message that Kingpin provides from `Required()` and leverage its error
formatting (we should probably use this for our other error messages
too).

The only difference is that `--position=POSITION` won't appear on the
first line of the Help text, which would have emphasised the fact that
it's required. It's possible to configure Kingpin's help text via
templates, but I don't think that's worth the trouble at this point.

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