add configurable local user name

Co-authored-by: Techx3 <56268269+Techx3@users.noreply.github.com>

src/common/emulatorConfig.cpp

@@ -21,6 +21,7 @@ void Shutdown() {
 
 void Load(const ConfigOptions& cfg) {
 	EXIT_IF(g_config == nullptr);
+	EXIT_IF(cfg.user_name.empty() || cfg.user_name.size() > MAX_USER_NAME_LENGTH);
 
 	*g_config = cfg;
 }
@@ -33,6 +34,10 @@ uint32_t GetScreenHeight() {
 	return g_config->screen_height;
 }
 
+const std::string& GetUserName() {
+	return g_config->user_name;
+}
+
 bool FullscreenEnabled() {
 	return g_config->fullscreen_enabled;
 }