mosh: Rename from mobile-shell

[daylightbrightledlight]

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Renaming mobile-shell to mosh to be consistent with actual package name.
See: https://mosh.org/

[daylightbrightledlight]

The cask mosh is actually a duplicate of this formula. Not sure why it's there.

[ilovezfs]

There's already a mosh alias so I don't think this is necessary but thanks for the PR nonetheless.

[ilovezfs]

Changed my mind. There's enough references in the upstream project to mosh not mobile-shell that we might as well rename it.

[DomT4]

What's with the removal of revision 1 here?

[ilovezfs]

Thanks for your first contribution to Homebrew, @daylightbrightledlight! Without people like you submitting PRs we couldn't run this project. You rock!