Add custom highlight groups #75
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This adds custom highlight groups for the hover window, and aliases them to the highlights used previously. With this patch, a user can create custom styles for the hover window that don't affect any other hover windows. With no customizations, it should look identical to before, with one exception: I switched the background of the source bar (
HoverSourceLine) to useTabLineinstead ofNormal.For the highlight names, I just picked what that felt right, but they could probably be improved. Additionally,
HoverSourceLinecould reasonably beFloatTitle,TabLine, orWinBar, but I pickedTabLinesince sources already useTabLineSelandTabLineFill.