add simple runtime; fix the issue of crashing when creating file and folder; some tweaks

Prism-ScriptCore/Src/Prism/Engine/Engine.cs

@@ -0,0 +1,15 @@
+using System.Runtime.CompilerServices;
+
+    namespace Prism
+    {
+        public class Debug
+        {
+            [MethodImpl(MethodImplOptions.InternalCall)]
+            private static extern void Log_Native(string message);
+
+            public static void Log(string message)
+            {
+                Log_Native(message);
+            }
+        }
+    }

Prism-ScriptCore/Src/Prism/Math/Transform.cs

@@ -9,8 +9,8 @@ namespace Prism
         public Vec3 Rotation;
         public Vec3 Scale;
 
-        public Vec3 Up { get; }
-        public Vec3 Right { get; }
-        public Vec3 Forward { get; }
+        public Vec3 Up;
+        public Vec3 Right;
+        public Vec3 Forward;
     }
 }