Fixes #12577. Created common/ComboBox.css file for generic/positioning styles.  Added automated test for ComboBox.  Removed templateString.
Fixes #12577. Created common/ComboBox.css file for generic/positioning styles.  Added automated test for ComboBox.  Removed templateString.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@24167 560b804f-0ae3-0310-86f3-f6aa0a117693

harbalk/delite,Sam-Cummins/delite,kitsonk/delite,Sam-Cummins/delite,harbalk/delite,kitsonk/delite