OC.Previews utility in JS side telling what preview mimetypes are available

[PVince81]

@rullzer @oparoz as discussed, a utility class on the JS side that stores a list of mimetypes for which previews are supported.

This makes it possible to get rid of "isPreviewAvailable" so the server doesn't have to compute and return this for every file.

[PVince81]

This could go even further and provide utility methods to retrieve previews either for file icons or also real thumbnails. Basically move "lazyLoadPreviews" here but give it a better name.

Then also find a way to override it for the public page.

[oparoz]

OK from me. Gallery already uses such an array to build the thumbnails list or the slideshow, so all good.

[PVince81]

@VicDeo didn't we add something recently to avoid 404s ?

[VicDeo]

@PVince81 here you go https://github.com/owncloud/core/blob/master/core/js/config.php#L172
Seems to be done since 10.0.0

[lock]

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