Genes panel updates

[maxkfranz]

Description of new feature

• [x] Disable the union button with 0 or 1 nodes selected
• [x] Click edge for intersection
• [x] Select nodes union (already have this)
• [x] Fade in animation / flash animation every time you update the list (change selection)
• [x] Title:
  • [x] All Genes (when no selection)
  • [x] Genes in Selection (when selection)
  • [x] Search Results (when searching)

Motivation for new feature

Some users don't understand what exactly is happening when the Gene panel updates.