Added multiple new instance related quest functions.
1. quest::GetInstanceIDByCharID(const char *zone, int16 version, uint32 char_id)
- Allows you to pull the instance ID of a client by character ID.
2. quest::AssignToInstanceByCharID(uint16 instance_id, uint32 char_id)
- Allows you to assign an instance to a client by character ID.
3. quest::RemoveFromInstanceByCharID(uint16 instance_id, uint32 char_id)
- Allows you to remove a client from an instance by character ID.
Added spell buckets, similar to spell globals.
- Uses a new spell_buckets table and the Spells:EnableSpellBuckets rule.
Added max level by data bucket.
- Uses data bucket char_id-CharMaxLevel and Character:PerCharacterBucketMaxLevel rule.