UI integration using visual elements

[WaynGames]

Implement custom visual element for displaying the ability info on screen.

The visual element should :

• Display the abilities icon in an ability book
• Display the cooldown time both numerically and grapphcally
• Display the ability name on hover
• Trigger the ability on click
• Assign ability to action slots
• Internationalization of ability tooltip
• Hide/Show ability book with new Input system
• Tirgger action slot's ability with new Input System

[WaynGames]

Known isssue, while a visual element has a change in its layout (size) it trigger enter/exit event that result in the tooltip flickering.
https://forum.unity.com/threads/issue-keeping-button-hover-state-when-updating-other-elements-on-the-screen.1101601/#post-7106764

[WaynGames]

Subscene and UITK work together in entities 0.50.
Still have issues in build though...