embed plugin loader directly into the launcher

PluginLoader/Data/WorkshopPlugin.cs

@@ -0,0 +1,43 @@
+using ProtoBuf;
+using VRage;
+
+namespace PluginLoader.Data;
+
+[ProtoContract]
+public class WorkshopPlugin : SteamPlugin
+{
+    private string assembly;
+
+    protected WorkshopPlugin()
+    {
+    }
+
+    public override string Source => MyTexts.GetString(MyCommonTexts.Workshop);
+    protected override string HashFile => "hash.txt";
+
+    protected override void CheckForUpdates()
+    {
+        assembly = Path.Combine(root, Path.GetFileNameWithoutExtension(sourceFile) + ".dll");
+
+        var found = false;
+        foreach (var dll in Directory.EnumerateFiles(root, "*.dll"))
+            if (dll == assembly)
+                found = true;
+            else
+                File.Delete(dll);
+        if (!found)
+            Status = PluginStatus.PendingUpdate;
+        else
+            base.CheckForUpdates();
+    }
+
+    protected override void ApplyUpdate()
+    {
+        File.Copy(sourceFile, assembly, true);
+    }
+
+    protected override string GetAssemblyFile()
+    {
+        return assembly;
+    }
+}