Cleaned up the "Projectile.cs" file to remove personal comments and attempted solution to fixing the issue of units not being able to shoot arrows backward.
- Fixed the conditional the projectile class uses to determine if a projectile should be angled or not;
- Fixed an issue where the graphic for the castle upgrade was missing.
Updated the function that changes the angle of the straigth projectile to work better the closer the enemy is to the shooter.
There is some more fixes to be done, as those close angles are too vertical.
