[script] [combat-trainer] Added necro_corpse_priority: setting

[hat071af]

Added necro_corpse_priority: setting to allow for prioritization of using corpses for either healing or pet creation. This does not change any behavior unless the setting is added to a yaml.

Default behavior is to prioritze healing from corpses over pet creation, and this is the same behavior as before this update. To have it do this, exclude the setting, leave it blank or set it to heal. To have it prioritize pet creation from corpses set it to pet.

Rituals other than consume/arise also have not changed. They are handled separately in the rituals section and continue to be prioritized behind both pets and healing as before.