Substantially improved performance of dragging and drop animations

-> Took DragView drawing out of the window and put it into the DragLayer
-> Added fade-in/out animations to transition between the final view
   and the DragView, after the view animates
-> Enabled hardware layers on Folder items which improves the
   performance Folder reordering

Change-Id: I4d92ca9fba172d1bab9efc215a99abcaadcdf503
diff --git a/res/values/config.xml b/res/values/config.xml
index a5d7b91..497011c 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -63,7 +63,7 @@
 
     <!-- Parameters controlling the animation for when an item is dropped on the home screen,
          and it animates from its old position to the new one. -->
-    <integer name="config_dropAnimMaxDuration">600</integer>
+    <integer name="config_dropAnimMaxDuration">500</integer>
 
     <!-- The duration of the UserFolder opening and closing animation -->
     <integer name="config_folderAnimDuration">120</integer>