UpgradeableSpawners - Levels 4.15.9

- Fixed. Max stack amount for WildStacker

The command framework has be refactored.

1. All admin (!) commands have been moved to /spawner admin
2. The tab completion has been improved and consistency across all commands is ensured.
3. The permissions for /spawner admin <subcmd> subcommands have changed.
   
   1. Example: /spawner admin give Permission: uspawners.admin.command.give
   2. It follows the same format for each sub command of /spawner admin. No further explanation needed.

+ Added: Option to limit stacked entity amount

  stacking:
    # -1: Disable stacking completely.
    # 0: Unlimited stacked amount of entities.
    max-amount: 0
+ Changed: All admin related commands have been moved to /spawner admin <subcmd>

- Fixed: Entity stacking with WildStacker

+ Updated: French locale by Nogopra

- Fixed: levels.yml reading when Turkish OS language

+ Added: Merging of spawned groups for wildstacker

+ Added: Integration with WildStacker that will spawn large groups of entity-amount to one entity instead of many

This update adds two new permissions which are required to be set, if you want players to receive the spawner item on spawner break
and if you want players to be able to upgrade their spawners.

+ Added: [Suggestion] "uspawners.drop-item" permission
    description: Drop the spawner item when players break the spawner.
+ Added: "uspawners.upgrade" permission
    description: Only allow players with this permission to upgrade their spawners.

+ Added: Override spawn amount manually to ensure a consisted amount of spawned entities per cycle

+ Added: Option "spawner.vanilla.claim.on-spawn" to convert spawners to USpawners when they spawn an entity
+ Added: spawn_amount upgrade (optional). To use this upgrade
you need to add it to levels.yml (see default here: https://github.com/Angeschossen/UpgradeableSpawners/blob/master/resources/levels.yml) and set enabled: true for the
upgrade item in your GUI language file.

   Example: Migrate data from SQLite to MySQL.

- Fixed: [#1676] Possible issue with same level values for two different levels (not confirmed) 

- Fixed: Butcher mode bypassing max entities per period limit
- Fixed: [#1669] Spawner breaking drops exp

- Fixed: Tab completion null error

- Fixed: {amount} placeholder not parsing for get.dropped message
- Fixed: uspawners.bypass.delete not allowing to bypass silktouch requirement

- Fixed: Possible spawner duplication, if target got untrusted from untrusted region