colorparse.go
func NewColorParser(str string, defText, defBack term.Attribute) *ColorParser {
	p := new(ColorParser)
	p.text = []rune(str)
	p.defBack, p.defText = defBack, defText
	p.currBack, p.currText = defBack, defText
	return p
}
func NewColorParser(str string, defText, defBack term.Attribute) *ColorParser {
	p := new(ColorParser)
	p.text = []rune(str)
	p.defBack, p.defText = defBack, defText
	p.currBack, p.currText = defBack, defText
	return p
}
// NewColorParser creates a new string parser.
// str is a string to parse.
// defText is a default text color.
// defBack is a default background color.
// Default colors are applied in case of reset color tag