EZP-22280: Added tests for BinaryLoader
EZP-22280: Adapted semantic config for image variations

To fit filter config from LiipImagineBundle
EZP-22280: Extended FilterConfiguration from LiipImagineBundle

Makes it possible to use image variations registered in eZ configuration in SiteAccess context,
in conjunction with variations registered in LiipImagineBundle config.
EZP-22280: Implemented ScaleWidthFilterLoader

BC with "geometry/scalewidth" filter.
EZP-22280: Implemented ScaleDownOnlyFilterLoader

BC with "geometry/scaledownonly" filter.