Embed FEEL editor in Table cells

[barmac]

• Table cell is a FEEL editor
• Table cell is a plain input if expression language is different than FEEL
• Escape blurs the input
• I can select suggestion with Enter
• I can select suggestion with mouse click
• Performance is acceptable even in a big table
  • FEEL editor is embedded only for active cell
• Focussed cell changes when use navigates cells with keyboard (tab, enter)

[barmac]

I was able to fix most of the interactions.
However, one of the fixes breaks the autosuggestion choice in the input expression. So that's what needs to be fixed yet.