Update earthsong.icls

Hello,

I have changed some earthsong colors trying to make it look more close to the style shown in http://daylerees.github.io/. 

Mainly, changed keywords color and method/function declaration and call colors. If it is ok for you, I can change it also to earthsong contrast and light. 

For my personal use I also changed debugging related colors, because with current ones is a bit hard to find breakpoints or current trace line. I can send you a screenshot if you want.

Thank you and nice work!!