mention.go
func GetTagsAsUniqueStrings(prefix rune, str string, terminator ...rune) (strs []string) {
	tags := GetTags(prefix, str, terminator...)
	for _, tag := range tags {
		strs = append(strs, tag.Tag)
	}
	return uniquify(strs)
}
func GetTagsAsUniqueStrings(prefix rune, str string, terminator ...rune) (strs []string) {
	tags := GetTags(prefix, str, terminator...)
	for _, tag := range tags {
		strs = append(strs, tag.Tag)
	}
	return uniquify(strs)
}
// GetTagsAsUniqueStrings gets all tags as a slice of unique strings. This is
// here to have a means of being somewhat backwards compatible with previous
// versions of mention