Graphic Fixes for Blue & Grey + Key line Color Update

Hi Everyone! 

I've updated the main outline color of the characters to be a deeper black so that the colors stand out more against backgrounds. I think this is the right move.

The other important update is that Blue Character had an error across all skin tone png sheets. Grey Character also had a stray pixel in some of the animations. So anyone using this character will benefit from this update! Please download and replace your sprite sheets accordingly.

Thank you!!