Making string struct a bit more simple and support only utf8.

Still just ascii for now but a bit easier to manager.
Use [..]A() functions from win api to not have to convert to wide char everywhere

JulietApp/main.cpp

@@ -46,7 +46,7 @@ void JulietApplication::Init()
 {
     Log(LogLevel::Message, LogCategory::Editor, "Initializing Juliet Application...");
 
-    Log(LogLevel::Message, LogCategory::Editor, "%s", GetBasePath());
+    Log(LogLevel::Message, LogCategory::Editor, "%s", CStr(GetBasePath()));
 
     GraphicsConfig config;
     GraphicsDevice = CreateGraphicsDevice(config);