{WCS|WMTS|WMS}Model uses RasterSource catalog

[echeipesh]

Currently OgcModels assume that all entries are a simple OgcSource which can be either MapAlgebraSource or SimpleOgcLayer.

SimpleOgcLayer is bound to RasterSource instance and therefore can not respond to temporal query.

This model should be updated to make use of the new RasterCatalog such that the WCS/WMS/WMTS query parameters and their temporal component can be evaluated to produce correct instance of RasterSources for given time stamp.

If more than one are returned the service should render raster from the source with the earliest timestamp. This implies that information about timestamp should be easily available to the WcsModel.