CppMode 0.4.3

Bug fixes

• Fixed bestCppStd() hanging when g++ not installed (3s timeout, fast-fail)
• Fixed OOM on low-memory machines — skip PCH when < 2GB RAM free
• Fixed linter output capped at 64KB to prevent memory exhaustion
• Fixed bestCppStd() blocking the UI — now runs in background thread
• Fixed bundled GL headers (gl.h, glu.h) causing CALLBACK macro errors on Linux/macOS
• Fixed std::span requiring C++20 guard

CI

• Integration tests on Linux, Windows, and macOS via GitHub Actions