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dev/watchman: ignore hidden files

Administrator requested to merge core/watchman into master

Created by: keegancsmith

Hidden files are often written to while you are editing (emacs and vim swap files for example). Currently this would trigger an event in watchman. So we add an exclude rule for ".*" glob. We take the existing expression and AND it with the exclude rule. So this change is

["allof", ["not", ["match", ".*"]], ${OLD_EXPRESSION}]

Also included in this change is a way to debug which files watchman thinks has changed. You set the environment variable WATHCMAN_DEBUG to a non-empty value.

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