Added overriding buttons for show sol and retry
Textual and common change for overrides
Changed semantic name enableRetryButton to enableRetry.
Merge branch 'override-buttons' of github.com:h5p/h5p-interactive-video into override-buttons
Semantics and descriptions for retry button changed.
Merge branch 'override-buttons' of github.com:h5p/h5p-interactive-video into override-buttons
Added behaviour group to subcontent.
Updated version numbers.
Merge branch 'override-buttons' of github.com:h5p/h5p-interactive-video into override-buttons
Fixed so all behaviour of subcontent wont be overwritten.
Merge branch 'override-buttons' of github.com:h5p/h5p-interactive-video into override-buttons
Resolve conflicts
Merge branch 'override-buttons'