Changing import / globals not considered a change

When changing the imports or globals inside the properties dialog for split constraints or the event wait constraint, the editor is not aware of these changes. As a result, if you only change the imports or globals in your process, the editor will not pick up the change and you won't be able to save the process.

Steps:
1. Create a new rules flow file using the "RuleFlow file" wizard.
2. Add an Event Wait and an End node. Create connections between them.
3. Save the file. Open the rf file in another editor (such as vi). Analyze the structure.
4. From the event wait node's properties, open the constraints -> global section. Add "global String testStr"
5. Try to save the file, which thinks it hasn't changed. Open the rf file in another editor (such as vi). Notice that the global variable is missing from the file.