IdentifyHelpfulExtensions is not suitable for rebracer.xml

I noticed that while I was working in VS2017 the property 
```        
<PropertyValue name="IdentifyHelpfulExtensions">false</PropertyValue>
```
had changed in `Rebracer.xml`. This is about a small popup that suggests some plugins that you might find helpful. Now this property shouldn't be synced between team member via `Rebracer.xml` at all. It is a strictly personal preference.