Add IceMage kit and playstyle support

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.

src/main/resources/languages/en_US.yml

@@ -45,9 +45,10 @@ craft:
 
 commands:
   kit:
-    usage: '<red>Usage: /kit <kitName></red>'
+    usage: '<red>Usage: /kit <kitName> <playstyle></red>'
     kitNotFound: '<red><kit> is not a registered kit!</red>'
-    selected: '<green>You have selected <kit> as your Kit!</green>'
+    playstyleNotFound: '<red><playstyle> is not an available playstyle!</red>'
+    selected: '<green>You have selected <kit> as your Kit with playstyle <playstyle>!</green>'
 
 scoreboard:
   title: '<gradient:red:gold><bold>SpeedHG</bold></gradient>'

src/main/resources/plugin.yml

@@ -9,4 +9,4 @@ depend:
 commands:
   kit:
     description: 'Select kits via command'
-    usage: '/kit <kitName>'
+    usage: '/kit <kitName> <playstyle>'