Ball Hit Power update

Patch 2.8 contains a few ball upgrades including Hit Power and slow down near the city. I have also looked into how to reduce the loading time of the levels and added some glow to the balls and the City. The game levels will load faster and high end graphical settings demand more of the GPU (shaders). [h1]New features[/h1] [list] [*]Ball Hit Power upgrade. [*]Ball slow down near the City upgrade. [*]Ball max speed upgrade. [*]Ball minimum speed upgrade. [*]City glow (- or + life). [*]Ball glow/tail update. [/list] [h1]Other[/h1] Improved loading time of the levels. I have reduced some images to save loading time and graphical memory.