Merge pull request #3933 from PiBa-NL/20180405-widget-invert
trafficwidget, invert option needed json parsing
Remove Whitespace
I'm aware this is a very large commit. Let me know if you'd rather have it broken down by file type (ie: PHP/shell scripts) so it would be easier to review.
-RJ
Don't read picture file if it does not exist
Revise picture widget to store inamge on file system, not in XML config
Add GUI support to display and set the PTI state.
Fixed #8303
Fixed #8301 CSRF Enabled on all widgets.
Enabled CSRF on all widgets.
Silence warnings generated by sysctl to standard error.
Add input validation to traffic_graphs_widget.php and fix JS encoding. Fixes #8302
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