refactor: Use the plugins Classloader not always minix's.

This could possibly lead to issues such as two plugins loading the same library but the second not having access to the first plugin and therefor throwing a class not found exception.

Author: DaRacci

Minix-Core/src/main/java/dev/racci/minix/core/MinixApplicationBuilder.java

@@ -1,9 +1,9 @@
 package dev.racci.minix.core;
 
 import dev.racci.minix.api.annotations.MinixInternal;
-import dev.racci.minix.core.loader.MinixGsonDependencyDataProviderFactory;
 import dev.racci.minix.core.loader.MinixDependencyVerifierFactory;
 import dev.racci.minix.core.loader.MinixExternalDependencyDataProviderFactory;
+import dev.racci.minix.core.loader.MinixGsonDependencyDataProviderFactory;
 import dev.racci.minix.core.loader.MinixPreResolutionDataProviderFactory;
 import io.github.slimjar.app.Application;
 import io.github.slimjar.app.builder.InjectingApplicationBuilder;
@@ -24,6 +24,8 @@
 import java.util.Set;
 import java.util.zip.ZipInputStream;
 import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.plugin.java.PluginClassLoader;
 import org.jetbrains.annotations.Nullable;
 import org.slf4j.Logger;
 
@@ -84,7 +86,12 @@ public static Application createApplication(final Plugin plugin) {
         }
 
         try {
-            final var app = InjectingApplicationBuilder.createAppending(pluginName, classLoader)
+            final var loaderMethod = JavaPlugin.class.getDeclaredMethod("getClassLoader");
+            loaderMethod.setAccessible(true);
+            final var loader = (PluginClassLoader) loaderMethod.invoke(plugin);
+            loaderMethod.setAccessible(false);
+
+            final var app = InjectingApplicationBuilder.createAppending(pluginName, loader)
                 .downloadDirectoryPath(downloadFolder)
                 .preResolutionFileUrl(urlPair.preRes)
                 .dependencyFileUrl(urlPair.deps)