Error marker information should come from the reconciler thread

The template is parsed with the actual FreeMarker parser, and the resulting exception (if any) is translated to an Eclipse error marker. The parsing happens asynchronously. This is fine so far. What's strange is that instead of relying on the standard reconciler mechanism, org.jboss.ide.eclipse.freemarker.editor.Editor tries to figure out when that information needs to be recalculated by examining the keydown events, instead of real change events. Thus it doesn't work if you are inserting text solely with mouse for example. Also the Editor tries to do this after each key stroke (unlike the reconciler mechanism, which waits until you stop typing for a moment). Also the asynchronous task execution it does has a flaw because of which sometimes ignores the last few changes.