Add a property tab for the process

[rsoika]

We need also a custom property tab for the process. E.g. profile settings, mapping of name fields.

[rsoika]

Example from main impl:

    <propertyTab
        id="bpmn2.jbpm.diagram.tab"
        replaceTab="org.eclipse.bpmn2.modeler.process.diagram.tab"
        class="org.eclipse.bpmn2.modeler.runtime.jboss.jbpm5.property.JbpmProcessDiagramPropertySection"
        type="org.eclipse.bpmn2.Process"
        afterTab="org.eclipse.bpmn2.modeler.description.tab"
        label="%propertyTab.label.Process">
    </propertyTab>

https://github.com/eclipse/bpmn2-modeler/blob/master/plugins/org.eclipse.bpmn2.modeler.runtime.jboss.jbpm5/plugin.xml

[rsoika]

finished