Add the Java12 beta for regression fixes

Signed-off-by: Alexander Diewald <diewald@fortiss.org>

oomph/af3.setup

@@ -56,10 +56,18 @@
     <requirement
         name="org.eclipse.xtext.sdk.feature.group"
         versionRange="[2.17.0,2.18.0)"/>
+    <requirement
+        name="org.eclipse.pde.java12patch.feature.group"
+        versionRange="[1.1.0,1.2.0)"/>
+    <requirement
+        name="org.eclipse.jdt.java12patch.feature.group"
+        versionRange="[1.1.0,1.2.0)"/>
     <repository
         url="https://download.eclipse.org/releases/2019-03/"/>
     <repository
         url="https://download.eclipse.org/technology/epp/packages/2019-03/"/>
+    <repository
+        url="https://download.eclipse.org/eclipse/updates/4.11-P-builds/P20190328-0035/"/>
     <description>Install the tools needed in the IDE to work with the source code of ${scope.project.label}.</description>
   </setupTask>
   <setupTask