Implement stripping of s and t parameters from Twitter links.

[demize]

Should address #37, though I didn't make it configurable as suggested there.

Also added a test URL to test_urls.md and test_urls.html.

Did not bump the version in the manifest; I can do that if necessary, though I figured I'd leave it up to the maintainers to decide when to bump the version.

[apiraino]

@demize looks great, thanks!

Minor nit: next time please split code formatting changes in a separate commit, it makes reviewing the actual code changes a little bit easier.

[apiraino]

closes #37

[ZacharyTalis]

Does this PR implement cleaning for Copy link to Tweet events? If so, I'm not able to replicate. Cleaning Twitter URLs in the address bar works as expected o7

Specs: Firefox Nightly v104 on Linux w/ web-ext-run.sh environment

[demize]

Does this PR implement cleaning for Copy link to Tweet events? If so, I'm not able to replicate. Cleaning Twitter URLs in the address bar works as expected o7

Specs: Firefox Nightly v104 on Linux w/ web-ext-run.sh environment

That's my bad; it looks like the cleaners need to be specified separately when the menu item is handled, and I missed that in my initial review. I can create a new PR to fix that tonight.

[ZacharyTalis]

thank youuu <3