Changed window title.
An extra circle is drawn each time freezetower is upgrade.
Refractered code in Sprite class.
Walls now show cracks if low on health.
Added a maxHealth and zombieTargetSelectionWeight to BuildingInfo constructor
Added the wall cracks image.
Walls no longer draw cracks if they arent visibil.
forgot to add the healthpack sprite to sprites.
Fixed bug while going through multiple trap doors.
commit