Theme the scrollbars in dark theme, and refactor theming support #2145
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@drewnoakes had wondered in #1882 if we could change the scrollbar theming to match our theming. I finally got around to doing that.
I also refactored some of the theming support generally now that things have mostly stabilized - was able to remove a bit of code on the C# side and get rid of several of the exports on the JS side, while consolidating the "initial" and "update" theming setups. Added a few more doc comments as well.
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