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/CMakeLists.txt

@@ -153,10 +153,14 @@ if (YAZE_BUILD_LIB)
     ${ABSL_TARGETS}
     ${SDL_TARGETS}
     ${CMAKE_DL_LIBS}
-    ImGuiTestEngine
     ImGui
   )
   
+  # Conditionally link ImGui Test Engine
+  if(YAZE_ENABLE_UI_TESTS AND TARGET ImGuiTestEngine)
+    target_link_libraries(yaze_c PRIVATE ImGuiTestEngine)
+  endif()
+  
   # Conditionally link PNG if available
   if(PNG_FOUND)
     target_link_libraries(yaze_c PRIVATE ${PNG_LIBRARIES})