Modified PROVIDENCE_CARRIER.lua to remove inheritance flag in script as this was causing the persistent damage tactical script to use the inherited units stats as opposed to its own, which resulted in the unit destroying itself.

Fixed major bug with methods used to detect if unit is considered as a hero across certain scripts, impacted units:
* Colicoid Swarm
* Lucid Voice

Fix is not save compatible and will require a new save.
If using an ongoing save, any battle with the units listed above will need to be autoresolved otherwise the framework will crash.

Applied same extra logic as PeristentDamageGalactic.lua to improve compatibility

Fixed potential compatibility issue with other mods that alters unit XML data (has removed entries).
Added extra logic in PersistentDamageGalactic.lua script.
Ensures units listed to have persistent damage are valid by confirming it has an XML entry first.