Take into account timeBehaviour parameter of layer

This takes into account the new timeBehaviour parameter (instead of relying on wms/wmts type for time specific behaviour).

Note that this PR requires https://github.com/geoadmin/mf-chsdi3/pull/216 to be merged first.

Would be glad if anyone could quickly review both and merge them, as I would need them to further develope the time dependant tooltip.