Update CMake configuration and CI workflows for improved compatibility and testing

- Updated minimum CMake version requirement from 3.5 to 3.16 to leverage new features and policies.
- Enhanced CI workflows to include additional build configurations for Ubuntu and macOS, improving cross-platform support.
- Added conditional linking for ImGui Test Engine in the CMakeLists, allowing for UI testing when enabled.
- Refactored CMake commands in CI to ensure consistent policy version handling and streamlined build processes.
- Introduced new constructors for MenuItem in the GUI to enhance menu item management and flexibility.

src/app/test/test_manager.cc

@@ -65,11 +65,15 @@ TestManager& TestManager::Get() {
 
 TestManager::TestManager() {
   // Initialize UI test engine
+#ifdef YAZE_ENABLE_IMGUI_TEST_ENGINE
   InitializeUITesting();
+#endif
 }
 
 TestManager::~TestManager() {
+#ifdef YAZE_ENABLE_IMGUI_TEST_ENGINE
   ShutdownUITesting();
+#endif
 }
 
 #ifdef YAZE_ENABLE_IMGUI_TEST_ENGINE