Theme consistency overhaul:

- Add surface shift option, start from surface by default (previously
  was surfaceContainer). Old colors can be attained by changing it back
to "container" in theme colors
- Remove borders on surface elements, mostly
- Fix popup distances
- Use surfaceContainer/sch by default on widgets

Widgets/DankToggle.qml

@@ -36,7 +36,7 @@ Item {
         id: background
         anchors.fill: parent
         radius: showText ? Theme.cornerRadius : 0
-        color: showText ? Theme.surfaceHover : "transparent"
+        color: "transparent"
         visible: showText
 
         StateLayer {