Enable usage of variables for paste views in the JOA 365 add-in

In the old/legacy add-in you had the functionality that you can use a variable manager for adding or using existing variables by editing the paste view and select elements.

Please implement the variable function for the JOA add-in as well.
Due to the fact that you cannot use variables from the Jedox server in a local Excel file with paste view implement the use of variables and/or named ranges from Excel.