[PetraAI] - Use enum-like variables instead of magic values. -- [1]
Improved readability. Easier find-and-replace.
This commit is focused on:
- BaseManager
- AttackPlan
- GarrisonManager
Patch by: @JCWasmx86
Differential revision: https://code.wildfiregames.com/D4334
Refs. #6256
Comments by: @Silier, @Stan