add refactored m2e-wtp features to maven project examples feature as dependencies so they'll be installed OOTB

Must add these as requirements to org.jboss.tools.maven.project.examples.feature:

https://github.com/jbosstools/jbosstools-central/blob/master/maven/features/org.jboss.tools.maven.project.examples.feature/feature.xml

• org.eclipse.m2e.wtp.jsf.feature
• org.eclipse.m2e.wtp.jaxrs.feature
• org.eclipse.m2e.wtp.jpa.feature