escapeshellcmd: add warning about spaces in paths on Windows #511
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It is a known issue that spaces are not escaped in shell commands, which can be especially problematic on Windows.
This adds a warning about this behaviour to the function, including a way to solve this in userland code.
Ref: https://bugs.php.net/bug.php?id=43261 (last two comments)
Also see: squizlabs/PHP_CodeSniffer#3214