Reodering some drawables

  > quantum_panel_shape is xml rectangle with no margin
  > quantum_panel_bitmap is 9-patch drawable with inbuild shadow and margin
  > quantum_panel uses xml-shape for lollipop and 9-patch image for lower
    devices. It includes margin. For shadow, use elevation on lollipop
  > All drawables have _dark variant
  > Using #f5f5f5 for panel background, instead of #ffffff

Change-Id: Ia7c6cea6d514ee3774fcf5fef6139650bdd53208
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 8a8514a..2fa16e7 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -103,11 +103,13 @@
     <dimen name="shortcut_preview_padding_right">0dp</dimen>
     <dimen name="shortcut_preview_padding_top">0dp</dimen>
 
+<!-- Theme -->
+    <dimen name="quantum_panel_outer_padding">4dp</dimen>
+
 <!-- Folders -->
     <!-- The amount that the preview contents are inset from the preview background -->
     <dimen name="folder_preview_padding">4dp</dimen>
     <dimen name="folder_name_padding">10dp</dimen>
-    <dimen name="folder_shadow_padding">8dp</dimen>
 
 <!-- Sizes for managed profile badges -->
     <dimen name="profile_badge_size">24dp</dimen>