ISSUE-498: Allow Panorama tour and single Panoramas to be overriden on all properties

[DiegoPino]

@roromedia this includes your commits too. I hope this aligns with your needs and also the other override options.

Using this you can now avoid the more complex override that used the media key, and go for overrides at the formatter/settings level using the new JS override

like

{
"mouseZoom": false
}

AND/Or at the Panorama Tour level like (RAW JSON of the TOUR itself)

"ap:viewerhints": {
        "strawberry_pannellum_formatter": {
            "author": "RoRO"
        }
    },

AND/OR at the individual Panoramas referenced from the tour (so at the Panorama ADO level/raw JSON) via

"ap:viewerhints": {
        "strawberry_pannellum_formatter": {
            "mouseZoom": true
        }
    },

And of course using as:formatter instead of "ap:viewerhints" and/or a $mediakey if you prefer that instead (which is not standard but I left it as a config option since this JS/PHP was the first one we extended before we made "ap:viewerhints" a global Viewer Override option)

Please test and let me know

This pull overrides #495 but includes your commits and also preserves your authorship/attribution.

Thanks