Implemented new framework for MCP Handlers. Made one handler with the new framework.

Docs/Blueprint-MCP-Registration.md

@@ -0,0 +1,33 @@
+
+# Ideas for BlueprintMCP handler registration
+
+UCLASS()
+class USpawnNodeHandler : public UMCPHandler
+{
+    UPROPERTY()
+    FString BlueprintName;
+
+    UPROPERTY();
+    FString GraphName;
+
+    UPROPERTY();
+    FString ActionName;
+
+    UPROPERTY(meta = "optional");
+    int PosX;
+
+    UPROPERTY(meta = "optional");
+    int PosY;
+
+    UPROPERTY()
+    ElxLuaValueType ValueType;
+
+    // Dummy field.  Nothing is actually extracted by the argument parser,
+    // but this tells the argument parser that the parameter "subtree" is
+    // supposed to be there.
+    UPROPERTY()
+    void Subtree;
+
+    virtual void Handle(Json, Result) override;
+};
+