Replace all remaining BigBoxes with StBoxLayouts or StBins

Also, remove a lot of cruft from genericDisplay.js leftover from
previous St-ifications, and remove the pre-gtk-2.16 hacks from the
status tray in panel.js (which are much less needed with the
nearly-all-black panel anyway).

https://bugzilla.gnome.org/show_bug.cgi?id=614516

data/theme/gnome-shell.css

@@ -145,6 +145,14 @@ StTooltip {
     spacing: 4px;
 }
 
+#statusTray {
+    spacing: 14px;
+}
+
+#statusTray:compact {
+    spacing: 8px;
+}
+
 /* Overview */
 
 .overview {
@@ -404,6 +412,10 @@ StTooltip {
     background-color: #1e1e1e;
 }
 
+.dash-results-container {
+    spacing: 4px;
+}
+
 /* GenericDisplay */
 
 .generic-display-container {
@@ -606,6 +618,11 @@ StTooltip {
   spacing: 4px;
 }
 
+#LookingGlassDialog StBoxLayout#ResultsArea
+{
+  spacing: 4px;
+}
+
 #lookingGlassExtensions {
     padding: 4px;
 }