refactor: JA_* a namespace Ja:: (estil aee_arcade)

source/main.cpp

@@ -92,7 +92,7 @@ auto SDL_AppInit(void** /*appstate*/, int /*argc*/, char* /*argv*/[]) -> SDL_App
     JG_Init();
     Screen::init();
     JD8_Init();
-    Audio::init();  // crida internament JA_Init i aplica Options::audio
+    Audio::init();  // crida internament Ja::init i aplica Options::audio
     Overlay::init();
     Menu::init();
 
@@ -146,7 +146,7 @@ void SDL_AppQuit(void* /*appstate*/, SDL_AppResult /*result*/) {
     Overlay::destroy();
     Resource::Cache::destroy();
     Resource::List::destroy();
-    Audio::destroy();  // el destructor del singleton crida JA_Quit
+    Audio::destroy();  // el destructor del singleton crida Ja::quit
     JD8_Quit();
     Screen::destroy();
     JG_Finalize();