[Networking] Squash one more network config script bug

'ps -edaf' wasn't giving the full command line when run from the shell
script so it was failing to find the right PIDs for dhclient and ifplugd
sometimes leaving them running to cause havoc with systems configured
to use static IPs.  Switch to using 'ps auxw' to get the full command
line in the process list allowing us to locate the right processes.
[Help] Add support for help/*.php files in plugins

This adds support for files in the help/ subdirectory in plugins
to allow plugins to take advantage of the 'F1' context-sensitive
help in FPP.  This works the same way in plugins as it does in
the rest of FPP.  As an example, when the file called matrixtools.php
is being viewed from the MatrixTools plugin, if the user presses 'F1',
then the file matrixtools.php in the help subdirectory of the plugin
will be loaded and displayed in the popup help viewer.