TmfAnalysisElement: Execute analysis in separate thread

This was done in UI thread and if module.schedule blocks due to
waitForCompletion (e.g. of dependent analysis) the UI thread blocks
until it's finished.

Change-Id: I5609f7cc06baf4e4c62c43b4fff3363415e3c1cc
Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>

tmf/org.eclipse.tracecompass.tmf.ui/src/org/eclipse/tracecompass/tmf/ui/project/model/TmfAnalysisElement.java

@@ -330,7 +330,10 @@ public IStatus scheduleAnalysis() {
         if (module == null) {
             return new Status(IStatus.INFO, Activator.PLUGIN_ID, String.format("null analysis for %s", getAnalysisHelper().getName())); //$NON-NLS-1$
         }
-        return module.schedule();
+        new Thread(() -> {
+            module.schedule();
+        }).run();
+        return Status.OK_STATUS;
     }
 
     /**