[Tizen][Runtime] Add the unittest for WGT widget handler.

This unit test let widget handler parse widget info
from manifest, and then check this widget info.

Widget info include 10 items of string info and
0 or more preference items.
So tests include:
-ParseManifestWithOnlyNameAndVersion
-ParseManifestWithAllOfOtherItemsAndOnePreferenceItem
-ParseManifestWithAllOfOtherItemsAndThreePreferenceItemsList