TLDR: Added ability to shoot fixed wall collisions and started on multi weapon system

feat: Add pathfinding, combat, and selection systems            
                                                                     
     - Implement A* pathfinding with smooth path and speed           
     variation                                                       
     - Add drag selection with formation movement for squad units    
     - Add agro cone detection and gun aiming for armed characters   
     - Add bullet physics with bearing/velocity and penetration      
     system                                                          
     - Fix wall collisions with stepped movement to prevent          
     tunneling                                                       
     - Add health indicator for enemies                              
     - Fix various type errors and rendering issues