vdt org.python.pydev.PyDevBuilder org.eclipse.ui.externaltools.ExternalToolBuilder clean,full,incremental, LaunchConfigHandle <project>/.externalToolBuilders/Ant Builder.launch org.eclipse.jdt.core.javabuilder org.eclipse.pde.PluginNature org.eclipse.jdt.core.javanature org.python.pydev.pythonNature