Optionally URL-encode parentheses

[tomayac]

(Migrated from GoogleChromeLabs/link-to-text-fragment#51.)

The Chrome extension created this link for me:
https://wiki.eclipse.org/Tycho/Reference_Card#:~:text=include%20source%20bundles)-,target%20runtime%20environment,-Specify%20which%20environments

Do you see the closing parenthesis ")" in the URL? That is a problem, just like an opening parenthesis, if you want to use that URL in a markdown documentlink, because the format is [My description](https://my.url.org/foo/bar). Now when using the URL in a link directly here on GitHub, it looks like this:

My description-,target%20runtime%20environment,-Specify%20which%20environments)

If I manually URL-encode the closing parenthesis as %29, the link looks OK:

My description

So please, enable the user to specify a list of characters which should be URL-encoded by default.

[tomayac]

(CC: @kriegaex)

[tomayac]

There's a user report in GoogleChromeLabs/link-to-text-fragment#55 about spaces that need to manually be encoded to %20. Maybe this issue can track both problems, parentheses and spaces.

[kriegaex]

Well, ideally it would address all characters which need to be properly encoded.

[herrkaefer]

Report of another character that's not encoded and can invalidate the generated link: the dash -. The default extension encodes it as %2D.

[tomayac]

Another case of this came up in GoogleChromeLabs/link-to-text-fragment#59.

[tomayac]

More issues related to URL-encoding in GoogleChromeLabs/link-to-text-fragment#87.