+ Args:
+ name: the name of the color to set
+ red: the color to set's red component value
+ green: the color to set's green component value
+ blue: the color to set's blue component value
+ force_16color: force fg to use 16 color mode
+ force_216color: force fg to use 216 color mode
+
+ Returns:
+ String containing the ANSI escape sequence to set desired foreground
+