[Unknown Mod][Adventure Map] Add a "Hero" button in the wandering troops rally window

[LeHerosInconnu]

A "Hero" button is added (always available) in the wandering troops rally window, between the "YES" and the "NO" buttons.

When all slots of the hero's army are occupied and wandering troops want to join the hero, the displayed window allows to go directly to the hero's screen with the "Hero" button to reorganize the troops, and the "YES" button is grayed out.

If the "Game: Hero and Captain have extended inventory for creatures" option is enabled (#2995), the "Hero" button is available, and the "YES" button is not grayed out.
Wandering troops are transferred directly to the extended inventory for creatures if the player presses the "YES" button.

In fheroes2:

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