Introduce indirect file access (simple shim currently, .pak support etc soon)

utils_file.go

@@ -0,0 +1,25 @@
+package GoRetro
+
+/*
+ * --------------------
+ * File Handler
+ * --------------------
+ * All IO should pass through this rather than direct file access to allow
+ * the use of archive files etc in future.
+ */
+
+import "os"
+
+type vFile struct {
+	Data []byte
+	Size int
+}
+
+func GetFile(filename string) *vFile {
+	Data, _ := os.ReadFile(Config.DataDir + filename)
+	vf := vFile{
+		Size: len(Data),
+		Data: Data,
+	}
+	return &vf
+}