Merge branch '3872-include-ELK-update-site' into 'master'

Target Platform: added org.eclipse.elk to target platform.

See merge request !6

org.fortiss.af3.target.target

@@ -45,6 +45,11 @@
 		<unit id="org.openjfx.feature.swt.feature.group" version="0.0.0"/>
 		<unit id="org.openjfx.feature.graphics.feature.group" version="0.0.0"/>
 	</location>
+	<location includeAllPlatforms="false" includeConfigurePhase="true" includeMode="planner" includeSource="true" type="InstallableUnit">
+		<unit id="org.eclipse.elk.algorithms.feature.source.feature.group" version="0.3.0"/>
+		<unit id="org.eclipse.elk.sdk.feature.source.feature.group" version="0.3.0"/>
+		<repository location="https://download.eclipse.org/elk/updates/releases/0.3.0/"/>
+	</location>
 </locations>
 	<launcherArgs>
 		<vmArgs>-Dosgi.framework.extensions=org.eclipse.fx.osgi</vmArgs>