Add an introduction and a conclusion for each XML Extension in the extension.xml produced by Studio

To help the daily life of Studio players, it could really helpful to have for each contribution in the XML the origin of it.

For XML extension, when you have a lot and you try to find the origin of this xml fragment, it becomes long.

So my idea would be for an XML extension I named "toto" with the following content:

<here is="my XML contribution"/>

The code produced in the XML Extension would be:

<!-- ******** toto XML Extension ******** -->

<here is="my XML contribution"/>

<!-- ******** End toto XML Extension ******** -->