Add guess-the-wyeworker gameplay

[joulei]

I'd say these could be split into different PRs, but mostly we want something along the lines of:

• Hide NPC profile pics by default #16
  NPC profile pics are hidden (nice to have: maybe outlined or just the black shape, "who's that pokemon" style)

• Define a set of NPCs with complete interactions in the json file #17
  Update the interactions in the json file so that NPCs have a set of questions/answers that lead to guessing who they are.

• Add a lives counter somewhere on the screen #18
  (e.g. 3 hearts on the top right corner)

• Add a "guess the wyeworker" mechanism #19
  At any given point of a conversation with a character, you can input text guessing who the character is, if you fail, you lose 1 life.

• Add Game Over screen to display when loosing all lives. #20

• Add win reward on correct guesses #21
  If you guess who someone is correctly you win something. (I'd add easter eggs like, winning a banana and after 5 bananas you get an extra life, or you trade them with someone for a key, etc..)

• You won! screen #22
  After you guess correctly all the NPCs, you win the game.