Character View and Spirit Cube Effects

Character view

Added a Character tab to the skills window, with Talents on the second tab. Character is the default tab.
View and rotate your character in 3D, with equipped items arranged around the model.
Inspect item tooltips and unequip items directly from their slots. Equipped items remain in your inventory as before.
View health, armor, resistance, attack power, critical chance, haste, stamina regeneration and block in one overview.
Keep the Character view open beside your inventory. Specialization icons remain available on both tabs.
With a controller, use LB / RB to switch tabs and LT / RT to change specialization while the skills window is focused.

Spirit Cubes attached to weapons at a customization bench now trigger effects when a mana-consuming special attack hits an enemy (M2 by default):
- Fire: burns enemies over time.
- Water: leaves a healing water area at the enemy’s position.
- Unholy: steals life from the enemy.
- Ice: slows movement and attack speed.
- Light: grants a temporary protective shield.
- Wind: briefly increases movement speed.
Effect strength scales with mana spent. Additional cubes give diminishing returns, and combining elements shares their strength.
Added colored flashes and glowing cube particles when effects trigger.
Updated Spirit Cube tooltips to explain their effects and how to use them.

These effects are ready for beta testers to try. They still need testing and will likely receive further balance adjustments.

Tripled healing from Water Bolts, Water Balls, Water Salvo, Water Swirl and Water Vortex.
Removed the cooldown from Healing Stream and updated its tooltip.

Improved terrain loading on CPUs with many cores.
Fixed a case where Mage Tower bosses could stop responding and become impossible to damage.