Introduce a new IceMage kit and wire playstyle support across the plugin. Changes include:
- Add IceMageKit with aggressive/defensive active & passive abilities, item distribution, and lifecycle hooks; caches ability instances and given items to reduce allocations.
- Register IceMageKit in SpeedHG on plugin startup.
- Update KitCommand to require a playstyle argument, validate it, select the kit's playstyle, and provide tab-completion for playstyles.
- Extend KitEventDispatcher with IceMage-specific handlers: spawn a circular volley of snowballs on ability use (cancelling the original projectile), mark spawned snowballs with persistent data, and apply freeze/slow effects on hit.
- Adjust GoblinKit to use a plugin getter and make inner ability classes static to avoid capturing the outer instance.
- Update language lines and plugin.yml usage to reflect the new /kit <kitName> <playstyle> usage.
These changes implement the IceMage feature and ensure proper playstyle selection and event handling while keeping allocations low and behavior consistent.
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