[Unknown Mod][Game] Indicate the spell duration bonus granted by artifacts

[LeHerosInconnu]

Indicate the spell duration bonus granted by artifacts.
For now, this concerns the Wizard's Hat and the Enchanted Hourglass artifacts.

The hero possesses the Wizard's Hat.
Hero screen:

In the hero screen, for the Spell Power, it is indicated:

"8 (+10)"

Instead of:

"8"

Spell Power information window:

In the Spell Power information window, the following is added:

(empty line)
"Current Modifiers:

Wizard's Hat (spell duration): +10"

Reference, Attack Skill information window, for the disposition of elements.

Hero's right click quick info window:

In the hero's right click quick info window, it is indicated:

"Spell Power: 8 (+10)"

Instead of:

"Spell Power: 8"

Hero's window, during combat:

In the hero's window, during combat, it is indicated:

"Spell Power: 8 (+10)"

Instead of:

"Spell Power: 8"

The hero possesses the Enchanted Hourglass.
Hero screen:

Same for the Enchanted Hourglass, with "+2".
If the hero possesses both artifacts, “+12” is used.

This is not an option.
This can be implemented directly in fheroes2.