Update 3 - Selection + Optimisations

In this Update, I changed the player selection from distance detection to ray-casting. I added a rotating circle when the mouse is hovered over an agent. I added a new shader to show where the player has already been, this makes the level more easy to navigate just like the original game. I added a UI popup when right-clicking on the player. This will be used for selecting actions.

This was a mostly visual update with some performance improvements. next I will work on shooting when an enemy is in the field of view.