Erwan

- Added a possibility to put a file "Res.txt" instead of the folder "Res". The file Res.txt is a simple 1 line text file, telling where to find the Res folder, terminated by "/". For example: "../../wagic_res".
This addresses issue 428 . This could also help us in the future, to develop mods.

JGE/src/JFileSystem.cpp

@@ -257,3 +257,14 @@ void JFileSystem::SetResourceRoot(const string& resourceRoot)
 {
 	mResourceRoot = resourceRoot;
 }
+
+string JFileSystem::GetResourceRoot() 
+{
+  return mResourceRoot;
+}
+
+string JFileSystem::GetResourceFile(string filename) 
+{
+  string result = mResourceRoot;
+  return result.append(filename);
+}