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Due to current shecc's implementation, modern editors with common lsp such as VSCode with C/C++ plugin is unable to properly analyze from main.c, even though the code is correct. Thus we adds some system header inclusion in certain files to resolve and suppress error message. Notice that due to current frontend's limitation, including defs.h in C source files other than main.c would result weird error, thus this is not introduced in this commit.
In addition, it's annoying that VSCode always generate .vscode folder with some plugin-specific setting config files. Therefore, we also ignore it to prevent accidentally adding the config file to stage.