Add scoring to card games (except flashcards)

As a first step towards adding scoring and linking teachers to the scores, please start by adding scoring to the card games.
Document describing scoring: https://docs.google.com/document/d/1GfR48JcLd1ZJMUOh8pHoGaZ3BEWItzd8cK4rzdjFx9c/edit?usp=sharing

1. Use the scoring icon that is already in the player (top right side)
2. Matching: 2 points per card matched correctly first time, 1 point per card if second try to place that card. 0 after that.
   Maximum score: 2 x number of cards to place x number of pages. (If working out percentages to show at the end)
3. Multiple Choice: 2 points if answer correctly on first attempt. 1 point if on second attempt. 0 points if gets answer right on third or more attempt
   Maximum score: 2 times number of questions (pages)
4. Memory Game: 2 points for each pair matched. (With no time limit, will probably get 100%, but with time limit, scores will be meaningful.)
   Maximum score: 2 x number of pairs of cards in the game.

Adding this scoring will help have us ready to build the competition for Israel's 75th birthday with UnitEd.