Fix improper tokenization of script tags

[winstliu]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

#90, take two, now that I understand what clamp patterns are. Makes style and script tag matching a bit saner, and fixes some incorrect scopes. In addition, overarching meta.tag.<tag-type>.html scopes have been added.

Alternate Designs

Not sure yet. Just wanted to get my PR fixed before investigating if this can be improved further now that I have two years more knowledge :). - see 5c92fe4

Benefits

Less wonky workarounds.

Possible Drawbacks

Just a hunch, but I believe this somewhat hurts multiline tags. - Fixed!

Applicable Issues

Fixes #82
Fixes #120

[winstliu]

Ok, multiline tag handling should be back on par with master. I'll add some extra tests when I get the chance.

[winstliu]

Some syntax themes (e.g. fizzy) may attempt to add .tag styling to the entirety of the embedded block due to the presence of meta.tag.script.html. This is not a problem with any of the core syntax themes. If it turns out to be a widespread problem, I will investigate reverting the new meta scopes.