Adding sort switch in FolderPagedView

> Adding options column in DB to store generation purpose flags
> Storing isSorted flag in FolderInfo
> Adding a switch for A-Z sorting (only visible if pageCount > 1)
> When in sorted mode, spring-load snaps to the target location for 1.5 seconds

Change-Id: I8c7c778d2cc3ccbd35a2890a1a705e1c1a7e9a66

src/com/android/launcher3/FolderCellLayout.java

@@ -133,7 +133,7 @@ public class FolderCellLayout extends CellLayout implements Folder.FolderContent
     }
 
     @Override
-    public int allocateNewLastItemRank() {
+    public int allocateRankForNewItem(ShortcutInfo info) {
         int rank = getItemCount();
         mFolder.rearrangeChildren(rank + 1);
         return rank;