Bugfixes and features

Features
+Extended collision detection so that it now has effect
+Added proper bullet physics and hit detection
+Added UI Text for score and lives
+Added start of death screen
+Added asteroid death
+Added bullet death
+Added reset player to center after death
+Added gun cooldown for bullet firing

Bugfixes:
+Fixed undefined error.
+Code cleanup and removal of debug logging.
Address merge conflict.