Move SDK Manager instal/uninstall checkbox to left of package name

This will makes it much easier selecting packages for install/uninstall
operations, and makes more space for the package name by removing the
operation column, as well as making changes more apparent by marking
pending changes in bold font.

Change-Id: Iec86c384195dd8c51fd8f00c1de56cdbb2bab62a
Reviewed-by: hjk <hjk@qt.io>

src/plugins/android/androidsdkmodel.h

@@ -42,8 +42,7 @@ public:
     enum PackageColumn {
         packageNameColumn = 0,
         apiLevelColumn,
-        packageRevisionColumn,
-        operationColumn
+        packageRevisionColumn
     };
 
     enum ExtraRoles {