Make attribution control collapsible.
Remove Logo Control from defaults
Remove Logo Control
Move Logos in attributions
Do not collapse Attributions when using OSM source
Register button handlers the new way
Add getter/setter for collapsed & collapsible
Add attributions example

Showing how to dynamically change collapsed/collapsible properties for ≠
map sizes.
Remove reference to ol-logo
Use @api annotation
Merge pull request #2159 from tonio/attributions

Merge Logo control into Attribution