Fix duplicated compare/replace menu contributions

With new EGit we got adapters to File on URiEditorInputs, so the
compare/replace popup menu contributions were contributed twice.

Fix this by moving contribution to menu extension point and new
SelectionTester.

Signed-off-by: Andrey Loskutov <loskutov@gmx.de>

Author: iloveeclipse

AnyEditTools/META-INF/MANIFEST.MF

@@ -38,6 +38,7 @@ Export-Package: de.loskutov.anyedit,
  de.loskutov.anyedit.jdt,
  de.loskutov.anyedit.ui.editor,
  de.loskutov.anyedit.ui.preferences,
+ de.loskutov.anyedit.ui.util,
  de.loskutov.anyedit.ui.wizards,
  de.loskutov.anyedit.util
 Bundle-RequiredExecutionEnvironment: JavaSE-1.7