Add hero Easterling Captain

[tdauth]

See https://lotr.fandom.com/wiki/Easterlings https://www.hiveworkshop.com/threads/pack-men-of-rh%C3%BBn.291624/

• Easterling formation/march/Testudo formation: https://en.wikipedia.org/wiki/Testudo_formation Requires at least X Easterlings and they form around the captain. They all gain a massive defence bonus and HP bonus, slow a bit down.
• Easterling Support: An Army of Easterlings spawns. Including Bannermen who only boost Easterlings.
• Horn of Easterlings: Increases the damage and attack speed of Easterlings
• Master at Combat: Takes on multiple targets (Cleaving attack but more interesting combined with stuns or knockbacks?).

[tdauth]

The ulti is Banner Carrier and he has more defense, no range attack anymore (maybe slow him down) and two new spells:

• Banner of Rhûn - Passive spell which lets Easterling warriors nearby burst out warcries and increases their attack speed etc. Berserk
• Increase Morale - Channeling spell which spawns healing waves to Easterling units.

Completely supporting hero for the Easterlings.