Conflicting mech prefab/bundle identifiers

Example of okay (albeit confusing) config:
```
chrPrfMech_phoenixhawkHotD-001:Prefab
chrPrfMech_phoenixhawkHotd-001:Bundle
```

Example of collision:
```
chrPrfMech_centurionBase-001:Prefab
chrprfmech_centurionbase-001:Bundle
```