JBIDE-16343 : rename 'Materialize Library' feature into 'Copy Classpath Libraries'

Signed-off-by: Fred Bricon <fbricon@gmail.com>
JBIDE-16343 : tweak warning messages

Signed-off-by: Fred Bricon <fbricon@gmail.com>
JBIDE-16423 Deadlock in AsYouTypeValidationManager