send the ball force through the network

[PhilDore]

Call the network manager from the Mediator::notifyNewBallShot and call the Mediator::receiveNewBall method to render the ball on the remote side

[KevinMottashed]

Readded slingshot firing

• The projectiles are now synchronised over the network.
• Added a sound when a projectile is fired.
• Added a utility for perspective related math (like inverting the perspective)

This seems to fix the performance issue that appeared after firing multiple projectiles.

Closed by 4fdc76010926441ec362f9939cf62399882d914a Closes $179