Add keybindings for local play characters

[dusan-turajlic]

We want to be able to play the game on a single computer. So we need to add functionality for second character keybindings.

Scenario 1: As a player, I want to be able to play a game with my friend on my computer

GIVEN Player one has started a two-player game
WHEN Player one presses WASD
AND Player two presses arrow keys
THEN both characters move independently

Scenario 2: As a player, I want to spawn on the map in a different location than the other player

GIVEN Player one has spawned
WHEN Player two spawns
THEN Player two has spawned in a different location than player one