* [Scaling] Add support for zone ID and instance version to NPC Scaling
# Notes
- Adds `zone_id` and `instance_version` to `npc_scale_global_base` table to allow for zone and version-specific scaling.
- Defaults back to `zone_id` of `0` and `instance_version` of `0` for global scaling.
- Scaling load precedence is as follows:
- `zone_id` of current zone and `instance_version` of current instance
- `zone_id` of current zone and `instance_version` of `0`
- `zone_id` of `0` and `instance_version` of `0`
* Remove debug comment.
* Use zone not NPC.
* SQL
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