First Hotfixes after the submission

I fixed a few very easy things and added some very necessary featrures:

-removed the Buttons in the shop that do nothing but taking away your mone
-Improved the enemy AI's pathfinding a bit/general AI improvemets
-Increased the Playtime from 5 minutes to 15 minutes, because it was basically imposible to get the more expensive items
-added a timer that shows how much time is left in this round
-added a delay for the respawn after dieing to disencurage it
-added pointers to the Enemies and the player on the Minimap as to make them more visable

Next up i will add some music and actually create some art for the game so that it actually looks acceptable.