refactor: JD8_* a namespace Jd8::

source/main.cpp

@@ -91,7 +91,7 @@ auto SDL_AppInit(void** /*appstate*/, int /*argc*/, char* /*argv*/[]) -> SDL_App
 
     JG_Init();
     Screen::init();
-    JD8_Init();
+    Jd8::init();
     Audio::init();  // crida internament Ja::init i aplica Options::audio
     Overlay::init();
     Menu::init();
@@ -147,7 +147,7 @@ void SDL_AppQuit(void* /*appstate*/, SDL_AppResult /*result*/) {
     Resource::Cache::destroy();
     Resource::List::destroy();
     Audio::destroy();  // el destructor del singleton crida Ja::quit
-    JD8_Quit();
+    Jd8::quit();
     Screen::destroy();
     JG_Finalize();
     ResourceHelper::shutdownResourceSystem();