Item tooltip rework

[builder-247]

Overview

This PR is a rework of the item tooltip system, very closely matching the in-game panorama UI.
The old tooltip code was no longer working as intended, and it was also made before the in-game
tooltip rework.

Changes

• Fixed number highlighting in ability tooltip description
• Moved AbilityBehaviour to its own component which is shared by ItemTooltip
  • Added dispel information to AbilityBehaviour
  • Renamed spell immunity to debuff immunity
  • Updated colors for damage types
• utility: added support for custom styles in styleValues
• Reworked item tooltips
  • Now displays stats correctly
  • Added neutral item tier
  • Added ability behavior
  • Added health cost, fixed mana cost and cooldown
  • Added patchnotes from last two minor patches, closes Add patchnotes to item hovers #3141

Known issues

For backpacked items the cooldown & mana icons get resized incorrectly, haven't figured out how to fix this Fixed in #3164

Comparisons

Patchnotes: