First Aid Tent HP bonus buffs based on hero Defense primary and secondary skill

[dredknight]

Changes the following aspects of First Aid Tent war machine:

• Changed: flat bonus healing amount from (10,20,50,100) per War Machine mastery to (0,20,40,80) per Defense mastery
• Changed: "Embalmer" specialization healing bonus to be based on defense primary stat instead on hero level.
• Added: Additional healing bonus based on Defense primary stat. Bonus is based on War Machines mastery level - 5,6,8,10

https://github.com/Might-Magic-Heroes-5-5/MMH55/blob/master/assembly/patches/MMH55%20production%20patches/FirstAidTent.yml