Update Actor:onTakeHit: remove duplicate code, add condition checks, and fix some issues:

1. Disruption Shield, Exoskeleton and some other shields are not displayed in HP bar
2. Damage Shield on_merge crash
3. Displacement Shield and Time Shield has the same priority
4. Shadow Empathy not working as intended
5. Band of Protection should no longer check "damage_shield" attr (See Orcs' DLC repo)
6. Remove the usage of 'damage_shield_absorb' attribute in DLCs.