Bump React-Window

[yativilli]

• Bumping react-window to 2.1.0 requires rewriting the parts of the code where FixedSizeList or VariableSizeList are used, since in the newest version, they have been replaced by List[].

[yativilli]

#280

[yativilli]

cd3eeda:
The Selector-Component that needed the change works mostly as before. Some small tweaks are still needed:

• On drag-and-drop and dragging, the dragged element no longer selects automatically
• AutoSizer caused bugs and I've temporarily removed it - will need to check why it bugged

[yativilli]

The Drag and Drop Error must have been the wind or a failure to reload: Cannot reproduce it (neither Edge, Chrome or Firefox)

[yativilli]

Either AutoSizer has a problem or something has changed there too: If I add Autosizer, the whole List disappears. The trick of adding height to its parent doesnt really seem to work

[yativilli]

Removed Autosizer from Selector: Substituted it with media queries.

[yativilli]

#292

[yativilli]

Needs some polish: When I input a searchstring that returned many entries, not all were correctly displayed: Some are (partially) hidden behind the parent-widget