Ability assets correction

[Jaccouille]

• Added/fixed few ids (heal reduction, sell item, spell steal)
• Added sundering blade model path
• Added AbilityDefinitionHealReductionBonus
• Added thunderclap setter for maximum damage

[Frotty]

Very nice 👍 Did sellItems change in reforged or was it always wrong?

[Jaccouille]

Based on the old version I have on my hard drive (checked units/abilitydata.slk), it was right on 1.28.5, wrong on 1.31 (24/04/2019)