Mobile Aiming Update

Updated the Mobile version to aim with a right virtual joystick as per Gamepad players.

Summary of how the change was made:

• Duplicated the left joystick into the right side,
• Added FindObjectsOfType<Joystick> into the InputController,
• initialised the left and right joystick variables,
• If the left joystick is enabled (i.e. it is a mobile device), use it to get the movements, 
• if the right joystick is enabled, use it to get the aim direction and trigger the primary fire if the movement is < -.2f || > .2f

Also added a "Ready" button for mobile player to set being "Ready".