Last minute touchups + Code documentation + Demonstration themes
- markup: fixed bug with extra </div> closing tag in scheme editing caused by preview
- block: fixed bug with block on anonymous user scheme block
- block: new "edit" button for super-administrator (UID 1), for quick access to scheme
- block: "select scheme" is now "select"
- block: blocks will no longer show up if scheme info not generated
- under the hood: color_find_scheme_by_UID() rewritten
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