Provide a printf replacement with colors.
This library provide a colorprintf function where colors can be set for a range using the syntax :
colorprintf "Hello $red[%s]." "world"
Fix printing escaped parts when text is accumulated. `colorprintfn "1 %d %d" 2 3` was generating `231` ([Issue #1](https://github.com/vbfox/ColoredPrintf/issues/1))