Allow servers to unlock all ability slots for all growth stages

Most playables have very few ability slots unlocked for hatchlings, and slowly gain access to their full kit as they grow. While this mechanic works well for officials, on many community servers it can be an awkward and frustrating restriction. It would be very helpful to have a config that allows server owners to unlock all ability slots at hatchling.

Some use cases:
- realism servers wanting to give babies more realistic capabilities
- deathmatch servers hosting "baby fight nights"
- roster-based servers using growth-capped playables as stand ins for smaller species

If there is some aspect of the game's coding that would make this difficult to implement, then it is understandable to prioritize other aspects of development. But if such a config could be implemented fairly easily, then it would be an amazing way to give server owners more freedom over the experience they want to create for their players.