Separate SQL database data to member data and role data

[CortexPE]

Reason for this is because some server setups may have a centralized member role database but separate permission sets across different servers.

For ease of configuration, it might be better to allow the ability to use MySQL for member data storage and YAML for role permissions and settings

[CortexPE]

Currently, setting the data storage option to MySQL controls the data storage for member data and role permissions. This will cause issues on server networks that need different permission sets across different PocketMine servers (e.g. different gamemodes)

[CortexPE]

oops 😂