Fix externally referenced DLLs in scripts

External DLL references weren't being used, this commit fixes them so they are used.

MinecraftClient/Scripting/AssemblyResolver.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace MinecraftClient.Scripting; 
+
+public static class AssemblyResolver {
+    private static Dictionary<string, string> ScriptAssemblies = new();
+    static AssemblyResolver() {
+        // Manually resolve assemblies that .NET can't resolve automatically.
+        AppDomain.CurrentDomain.AssemblyResolve += (sender, args) => 
+        {
+                var asmReqName = new AssemblyName(args.Name);
+                
+                // Check the script-referenced assemblies if we have the DLL that is required.
+                foreach (var dll in ScriptAssemblies) 
+                {
+                    // If we have the assembly, load it.
+                    if (asmReqName.FullName == dll.Key) 
+                    {
+                        return Assembly.LoadFile(dll.Value);
+                    }
+                }
+
+                ConsoleIO.WriteLogLine($"[Script Error] Failed to resolve assembly {args.Name} (are you missing a DLL file?)");
+                return null;
+            };
+    }
+
+    internal static void AddAssembly(string AssemblyFullName, string AssemblyPath) 
+    {
+        if (ScriptAssemblies.ContainsKey(AssemblyFullName))
+            return;
+        
+        ScriptAssemblies.Add(AssemblyFullName, AssemblyPath);
+    }
+}