JBIDE-17713 : introduce ProjectExampleWorkingCopy

Signed-off-by: Fred Bricon <fbricon@gmail.com>
JBIDE-17714 : move maven examples to project examples component

Signed-off-by: Fred Bricon <fbricon@gmail.com>
JBIDE-17464 : import regular projects along the Maven ones

Signed-off-by: Fred Bricon <fbricon@gmail.com>