Update prototype 3

The enemy now reacts to the character.

So far, the enemy does not have its own model, the model of the main character is used.

The enemy can be added via the test menu by pressing the 1 or T key.

Various small changes and fixes.

The game is now on a new version of the unreal engine (this is a necessary step). I hope that this won't cause any new problems, and maybe even the game will work better.