Fixed annoying confusing error messages appearing on Console during
development due to com.googlecode.efactory.tests.xtextintegration
IGenerator deactivation introduced in commit
8c81112d479326a898c1257977bbf65e6da80c61

Signed-off-by: Michael Vorburger <mike@vorburger.ch>
replaced com.googlecode.efactory.formatting.Function<ARG1, ARG2> by
org.eclipse.xtext.xbase.lib.Procedures.Procedure2<ARG1, ARG2>

Signed-off-by: Michael Vorburger <mike@vorburger.ch>
fixes re. ui.editor.tree

Signed-off-by: Michael Vorburger <mike@vorburger.ch>