[Suggestion] Replace dependency on installed Microsoft Excel

[Anheledir]

With the NPOI library you can read/write Office documents easily without any dependency on an installed Office-Product. That might be a good replacement for the current dependency on an installed Microsoft Excel on the machine. Already using it in one of our projects successfully, the implementation is really straight-forward.

[martinfabianthomas]

Thank you for this suggestion. That dependency had been bugging us as well (for multiple reasons). I will be working on transitioning to NPOI as soon as I can.

[Anheledir]

I'm currently working on the implementation and will have a pull-request ready in the next few weeks. :-)