WIP: (!315) MHHs: now have +10% level-up bonus rather than +5%

Add changelog:

Men
Knights of Dol Amroth:
--- Damage decreased to 170 (from 200)
--- Now earn +10% health and damage per level (from 5%)

Elves
Noldor Warriors:
--- Bow damage decreased to 200 (from 240)
--- Now earn +10% health and damage per level (from 5%)

Dwarves
Zealots:
--- Health decreased to 900 (from 1000)
--- Damage decreased to 180 (from 200)
--- Now earn +10% health and damage per level (from 5%)

Isengard
Deathbringers:
--- Damage decreased to 210 (from 250)
--- Now earn +10% health and damage per level (from 5%)

Goblins
Fire Drake brood:
--- Damage decreased to 150 (from 175)
--- Now earn +10% health and damage per level (from 5%)

Mordor
Black Riders:
--- Health decreased to 1500 (from 2000)
--- Damage decreased to 150 (from 175)
--- Now earn +10% health and damage per level (from 5%)