Oomph: Add git repo-centric working sets.

* Adds three working sets for AF3 official plugins, dev products, and
  kernel plugins.
* The working sets collect all plugins that belong to the same repo. It
  is identified by a reference plugin.
Signed-off-by: Alexander Diewald <diewald@fortiss.org>

oomph/af3.setup

@@ -10,7 +10,7 @@
     xmlns:setup="http://www.eclipse.org/oomph/setup/1.0"
     xmlns:setup.p2="http://www.eclipse.org/oomph/setup/p2/1.0"
     xmlns:setup.workingsets="http://www.eclipse.org/oomph/setup/workingsets/1.0"
-    xsi:schemaLocation="http://www.eclipse.org/oomph/setup/git/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/Git.ecore http://www.eclipse.org/oomph/setup/jdt/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/JDT.ecore http://www.eclipse.org/oomph/predicates/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/Predicates.ecore http://www.eclipse.org/oomph/setup/projects/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/Projects.ecore http://www.eclipse.org/oomph/setup/workingsets/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/SetupWorkingSets.ecore http://www.example.org/CommandLine/1.0 https://raw.githubusercontent.com/maybeec/oomph-task-cli/master/task-cli-updatesite/model/Oomph-cli-task-1.0.ecore"
+    xsi:schemaLocation="http://www.eclipse.org/oomph/setup/git/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/Git.ecore http://www.eclipse.org/oomph/setup/jdt/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/JDT.ecore http://www.eclipse.org/oomph/predicates/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/Predicates.ecore http://www.eclipse.org/oomph/setup/projects/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/Projects.ecore http://www.eclipse.org/oomph/setup/workingsets/1.0 http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/models/SetupWorkingSets.ecore"
     name="autofocus3"
     label="AutoFOCUS 3 (Developer)">
   <setupTask
@@ -334,6 +334,26 @@
           xsi:type="predicates:NamePredicate"
           pattern="org.fortiss.af3.task(\.ui)?"/>
     </workingSet>
+    <workingSet
+        name="GIT - AF3 plugins"
+        id="">
+      <predicate
+          xsi:type="predicates:RepositoryPredicate"
+          project="org.fortiss.af3.project"/>
+    </workingSet>
+    <workingSet
+        name="GIT - AF3 dev products"
+        id="">
+      <predicate
+          xsi:type="predicates:RepositoryPredicate"
+          project="org.fortiss.af3.phoenix.product.top"/>
+    </workingSet>
+    <workingSet
+        name="GIT - Kernel plugins">
+      <predicate
+          xsi:type="predicates:RepositoryPredicate"
+          project="org.fortiss.tooling.kernel"/>
+    </workingSet>
     <description>Standard working set definitions.</description>
   </setupTask>
   <setupTask