Only allow player to shoot if player does not have any projectiles pending

src/common/Player.cc

@@ -20,5 +20,6 @@ Player::Player()
     m_shot_start_x = 0.0;
     m_shot_start_y = 0.0;
     m_shot_direction = 0.0;
+    m_shot_allowed = true;
     
 }

src/common/Player.h

@@ -26,7 +26,7 @@ class Player
         double m_shot_start_y;
         double m_shot_direction;
         double m_shot_start_time;
-        
+        bool m_shot_allowed;
 
         Player();
 };