Format file, such as file line ending into unix(LF) and encoding into utf8-bom.
For a example:
// Inplace format *.h,cpp,.c FileFormat -i input_root_dir
// Format .h,.cpp,*.c from input root dir to output root dir FileFormat -i input_root_dir -o output_root_dir
// Format .txt,.csv FileFormat -i input_root_dir -e .txt,.csv