使用過的Dependencies and Extension

1. Distance Tool (will make contrubutions to the UI)
   Dependencies: net.refractions.udig.project.ui
   Extension: net.refractions.udig.project.ui.tool
   
   
2. CustomApp (will not make contrubutions to the UI)
   Dependencies: net.refractions.udig.ui
   Extension: org.eclipse.core.runtime.applications, org.eclipse.ui.perspectives, org.eclipse.ui.perspectiveExtensions