jLevels

Removed %jlevel% PAPI placeholder in favor of following new placeholders:

• %jlevels_level% - current level
• %jlevels_xp% - current xp
• %jlevels_required% - xp required for level up

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• Added a maximum level
• Added level colours (set with colour: "<colour_code>" inside level-rewards)
• Removed feature to use different language depending on Player's locale