Looks for the plugin resource file.
This should be used to get the plugin read location of the config file. You should only use the returned path to read information from, since it might point to a not-writable file (in kiosk mode for example).
See also: save_location and resource_lookup
| this |
an PanelPlugin. |
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The path to a config file or null if no file was found. The returned string must be freed using g_free |