Merge branch 'powerups/board' into develop
Experimental
Merge branch 'develop' into powerups/api
Fix rendering and html-behaviour of DescriptionPowerup.
Fix rendering for powerups so that they don't merge into header.
Update powerup API to support specified values.

Issues were encountered in powerups/board that resulted in the data-powerup-field value needing a possibly undefined support value.
Merge branch 'powerups/api' into powerups/board

(Cherry picked merge not containing powerups/api's experimental functions)