Update attribution CSS #2803
Merge remote-tracking branch 'upstream/master'
Removed unnecessary max-width from CSS .ol-attribution ul
Merge pull request #3038 from acanimal/master

Update attribution CSS #2803
Add hit-detection framebuffer to context
Add hit-detection support for webgl
Use hit-detection images
Make sure hit-detection atlas is in sync

... with the atlas for the original images, so that
the offsets are the same.
Remove hitDetectionOrigin
Make icon example work with webgl
Reduce number of arrays created
Use renderBuffer for hit-detection
Add `hasFeatureAtPixel` function to map
Implement hasFeatureAtPixel for canvas
Implement hasFeatureAtPixel for webgl
Show hasFeatureAtPixel in example