Split Editor and Runtime into separate namespaces, Created Texture and Mesh classes

Runtime/PSXTexture.cs

@@ -0,0 +1,22 @@
+using UnityEngine;
+
+namespace PSXSplash.RuntimeCode {
+    public enum PSXTextureType {
+        TEX_4BPP,
+
+        TEX_8BPP,
+
+        TEX16_BPP
+    }
+
+    [System.Serializable]
+    public class PSXTexture
+    {
+        public PSXTextureType TextureType;
+        public bool Dithering = true;
+
+        public void Export() {
+            Debug.Log($"Export: {this}");
+        }
+    }
+}