Fix reference to teiidDB.xmi file

* Moves teiidDB.xmi out of src directory and into a location that can be
  referenced by the plugin.xml at build and runtime.
TEIIDDES-2296
 * simplified timeout message on DDL page
 * Removed extraneous layers of Composite on DataSourcePanel and DataSourcePropertiesPanel
 * Added Importer Description to SelectDataSourcePage
 * Hilighted Default Server version font/text
Merge pull request #394 from phantomjinx/TEIIDDES-2268

Fix reference to teiidDB.xmi file