Alter colours regolf uses to return feedback; make bot-nick a variable

This alters the colours regolf uses to return feedback from green for correct, and none for incorrect to the following:
  Correct hit: dark green (03)
  Missed hit: dark gray (14)
  Hit wrong word: red (04)
  Missed wrong word: dark gray (14)

Furthermore, this makes $nick a variable, this is used in the string 'regular expression(s) using /msg $nick expression'
 So that the actual name will be messaged; not a static string.