refactor: JI_* a Ji:: i JG_* a Jg::

source/main.cpp

@@ -89,7 +89,7 @@ auto SDL_AppInit(void** /*appstate*/, int /*argc*/, char* /*argv*/[]) -> SDL_App
     Options::setCrtPiFile(std::string(file_getconfigfolder()) + "crtpi.yaml");
     Options::loadCrtPiFromFile();
 
-    JG_Init();
+    Jg::init();
     Screen::init();
     Jd8::init();
     Audio::init();  // crida internament Ja::init i aplica Options::audio
@@ -149,6 +149,6 @@ void SDL_AppQuit(void* /*appstate*/, SDL_AppResult /*result*/) {
     Audio::destroy();  // el destructor del singleton crida Ja::quit
     Jd8::quit();
     Screen::destroy();
-    JG_Finalize();
+    Jg::finalize();
     ResourceHelper::shutdownResourceSystem();
 }