[Feature Request]: Restore Excel Addin logic

[Freymaurer]

At the moment, there are still requests for people wanting to use Swate in Excel. To enable this we will soon be welcoming a new colleague, who will start working on the Excel plugin logic.

[!NOTE] Restoring this logic, will also enable us to update the old Swate version on https://swate.nfdi4plants.org

Feature list

• [ ] #446
• [x] #447
• [ ] #448
• [ ] #449
• [ ] #450
• [ ] #451
• [ ] #453
• [ ] #452
• [ ] #454

Optional Features

• [ ] Use js transpiler to make code ie11compatible for Excel2019