Redesign of the champions and Two new units: Chosen Bloodshots and Mastodons.

Updated for Immortal Empires, everything should work

Thanks to @Marcus Aurelius for giving a look in the files and letting me know which part broke.

Thanks to DarkRite, campaign bonuses of Khorne now applies to the new units in the following way:
Bloodlings gains benefits from warhounds
Bloodshots from warriors
Hemorragers from Bloodletters
Gore Chaerger from Khornataurs
Champions from warriors
and the new soul grinder gain bonuses from... soul grinders.

Can't thank DarkRite enough for telling me exactly how to do it, as a new modder I'm still clueless about a lot of things.

Second mini-update of the night: Bloodshot projectile model fire arrows have been replaced by flaming bullets. Didn't know it was this easy to implement

Weapons disappearing when you zoom out should be resolved.

Updated damage from Hemorragers in close combat: it was to much before. Seems more balanced now: compared to exalted bloodletters, who cost a bit less gold, they do kind of similar dpsnow, but Hemorragers conserve their mobility and their ability to snowball.