GTK, C Programming, VSCode Settings

• 참고: https://stackoverflow.com/questions/66301156/vs-code-c-c-configuration-for-gtk-development
• 참고: https://stackoverflow.com/questions/58751821/how-to-configure-vscode-for-gtk3-for-intellisense-build-debug-and-g -참고: https://gist.github.com/Acry/e0a167f6d323feb0519edb47248ab3bf