title should set to gadget's default userPref

The text-gadget has a title preference, but most of gadgets don't have it.

These gadget's title is gadget name+ filter name. However, sometimes we need use one filter in several gadget to view different scene, but all them title is cannot to distinguish. See below.

So, i think the title can be gadget's default preference. If it is empty, gadget name is gadget name+ filter name, otherwise it's gadget name+ user's configuration.