[JavaScript] Swipe to go back (web debug control panel)

[MattIPv4]

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The web debug control panel, when used as a web app on iOS does not have the ability to swipe to go back. Swipe to go back should be implemented on the fixture and channel control pages to navigate up the page structure (fixture to home, channel to fixture). This should ideally be done using vanilla JS as jQuery or similar are not currently in use on the site and I would like to keep it that way.