JBIDE-13985 - Remove "REST" in "JAX-RS REST Web Services"

Done and externalized labels in a message bundle.
[JBIDE-14757] NLS missing message

Remove missing message from JaxrsPreferencesMessages class
JBIDE-14988 - Remove missing/old jars from build configuration
JBIDE-13580 - NPE when duplicating Java Method

Ignore Method bindings if they are null.
Also rework on CollectionUtils to compare maps
When creating JAX-RS Resource, retrieve all Java Method Signatures at once if possible (avoid multiple call to visitor)
JBIDE-14913 - JAX-RS Web Services node is empty after project import or workbench startup

displaying the "Loading..." node when the Metamodel is being built
Using a proper Mutex Rule to avoid multiple concurrent builds
Registering the Metamodel Listener at the right moment and only once, so that changes
can be applied on the UI
JBIDE-14988 - Remove missing/old jars from build configuration

Adding missing entries for jaxb-xxx-2.2.5.1.jar in build.properties