[Improvement] Forcing a Metadata update

[BenediktBergmann]

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It would be nice to have the possibility to force a Metadata update without the need of closing the XrmToolBox (XTB).

Example Scenario: I open the XTB and create some queries using Fetch XML Builder (FXB). While XTB is still open I create a new table or a column on an existing table. To be able to use the newly created table/column I have to close the XTB and reopen it so that the Metadata is updated. This costs time especially because I might have to recreate all queries.

I also created the same issue in the FXB Repo https://github.com/rappen/FetchXMLBuilder/issues/897