Multiple Ghost & Clue to Collect

Updated v0.10.0, with multiple ghosts to heat up the game and more clues to collect to reveal them:

Player Count:      less than 9        9 - 12             16+
Ghosts Count:            1                       2                    3
Clues Count:               5                     5+3             5+3+2

Note that ghost cannot tell who is the other ghost, and can stab another ghost by accident. This is by design and so far it has only been making the game much more fun lol