Improve ControlPanel Settings style-ability

[pmario]

This PR improves the ControlPanel Settings style-ability as requested by @twMat at https://github.com/Jermolene/TiddlyWiki5/pull/8000#issuecomment-2178307290

Quote from Mat,

I do note that each setting still has the inline style="border-top:1px solid #eee;" (which makes it impossible to override with a custom stylesheet) so I'm wondering if this should perhaps be moved into the introduced class="tc-control-panel-setting" ?

• The hardcoded style is removed, because there is no real reason for it
• tc-control-panel-setting got border-top: 1px solid <<colour blockquote-bar>>; as a setting separator

I did use the palette colour for blockquote-bar, because it is a good fit with all existing palettes.

Blockquote bars are usually placed into the tiddler content area and they have a contrast, that is not "intrusive". That's exactly the behaviour we need for a setting separator

This PR is related to the PR

• 8000

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Name	Status	Preview	Updated (UTC)
tiddlywiki5	✅ Ready (Inspect)	Visit Preview	Jun 19, 2024 4:22pm

[pmario]

@Jermolene -- This PR is a fix for PR #8000 which is part of TW v5.3.4 -- So IMO this one should be considered as a "bug fix" and should go into v5.3.4

[Jermolene]

Thanks @pmario