Make use of editorservice as it's better than overlay

[patrickdemooij9]

2 Changes here:

• Use the editorservice for infinite editing instead of overlays. I think overlays won't be supported in the future as you cannot even find them in the Umbraco 8 documentation anymore.
• Broadcast "formSubmitting" when submitting any changes. I had some problems with the timing of data saving when using Macro's. The data sync on the macro would occur after the data was added to the cell in some instances. With the broadcast, every item under it will sync their content so that we have the most up to date information ready.