Help: Add support for launching with a section and page, like man

I found it strange that `man` and `Help` did not accept the same command
line arguments since they are so similar. So... now they do. :^)

This means you can now open for example the `tar` man page in Help with
`Help tar`, or `Help 1 tar` if you want to disambiguate between pages in
different sections.

If the result is not found, it falls back to the previous behavior,
treating the input as a search query.

Initially I had this written as two optional positional arguments, but
when told to parse `[optional int] [optional string]`, and then given a
string input, ArgsParser forwards it to the [optional int], which then
fails to parse. Ideally it would pass it to the second, [optional
string] arg instead, but that looks like a fairly big change to make to
ArgsParser's internals, and risk breaking things. Maybe this ugly hack
will be an incentive to fix it. :^)

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