Added optional command-based flight system with /flight (configurable via command-mode.enabled setting)
new commands:
/ufw add/set/remove <player> <time>
/ufw speed add/set/remove <player> <speed>
/ufw check <player>
Added option to disable the upgrade system
Reset config or add:
upgrades: enabled: true/false
Added option to change the custom model data of the wand
Reset config or add
wand: custom_model_data: -1
