Show score the show score button is pressed.
Use number of possible instead of score. This number is the same as score without the minus points.
Changed 'show solution' button to a 'check' button, to represent the functionality of the button.
Changed icon of check button to check icon.
Changed default value of check button to 'check'.
Changed semantics label and default to correspond with the changes.
Changed enable retry and show solution names.
oppg885
Merge branch 'check-insteadof-showsol' of https://github.com/h5p/h5p-drag-question

Conflicts:
	js/dragquestion.js
Renamed an invalid css class.