Overhaul for visual refresh (#383)

* Overhaul for visual refresh Almost entirely powered by vars * more fixes, reactions * conflicts * Unified shared variables/split out contrast files Unified the variables lightfix uses Split out accent on text contrast fixes for dark themes Added missing variables * theme icons move recolour mixin * move to stop log spam * Vencord custom switches * Drag & Drop upload area * missing vars & tweaks fixed a missing comma changed thread icon colour codeblock background feedback vars * make lightfix more dynamic fixes some edge cases with specificity & some selectors in details not included under .light-theme * various fixes more dark contrast selectors online indicator settings quest page and forum gradients notice variables * mentions/channel links hovered contrast ---------