Add iterwalk package to speed up large directory listing #149
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By default, filepath.WalkDir gathers all files and sorts before outputing. On testing with a directory with over a million small files, this leads to a multi-second start lag.
This slightly forks and changes the WalkDir command to iterate on a directory. This removes sorting (CPU improvement), and speeds up the initial request significantly. (Negligible). For some reason this method is ever so slightly slower than filepath.WalkDir (few microseconds), but average use that won't be noticeable, and for large searches this will be a significant improvement.