Webservices: RestService, ViewToolItem, more RedDeer, refactoring

Created RestService class that represents item (rest service) in JAX-RS Explorer.
More RedDeer - reimplemented some dialogs, view, jax-rs explorer, condition.
Refactoring - removed unused imports, deprecated types and also updated javadoc comments.
Fixed problem with not found ToolItem (usage of ViewToolItem has fixed the problem).

JBoss Tools Component: webservices
Author: rrabara