Updated the way the Client gets the IWidgetFactory.
I updated the Client so that it retrieves the IWidgetFactory using a static interface method that accesses the Extension Registry. I have removed several unused components too and made minor adjustments to other files as required, such as removing files from build.properties. I fixed a bug in the build that would miss test files that ended in Test.java instead of Tester.java. I also added an existence test for IWidgetFactory.getWidgetFactories(). Signed-off-by: Jay Jay Billings <email@example.com>