Player Spawn Points, Sprites, and Direction

Added additional variable to player to keep track of who's player 1, 2,
3, and 4. Each player has their own spawn point and character sprite.
Every time a new player joins, game will be reset (1-2 set sec delay for
node to handle assignment) so everyone starts at their own spawn point.
Player direction (right/left sprites) also implemented locally, but not
on remote players. Also added wood platforms that sometimes may not get
drawn on first load. Character and wood sprites added as placeholders.