Handle xdotool commands

Currently the two commands are type and key. type is used to type a character and key is used to type a special character like Enter or Backspace.

type is specified by ‘{kb_cmd:xdotool}:’, and key is specified by ‘{kb_cmd:kxdotool}:’. If the command is not specified and alwaysUseXdotool is set from the environment variable, it will default to type.

handle xdotoool commands 
if alwaysUseXdotool || strings.HasPrefix(message_string, "{kb_cmd:xdotool}:") {
    message_string = strings.TrimPrefix(message_string, "{kb_cmd:xdotool}:")
    if message_string == "" {
        message_string = "\n"
    }


    if characterRegex.MatchString(message_string) {
        for _, character := range message_string {
            charString := string(character)
            if charString == "\n" {
                charString = "Enter"
            } else if charString == "\t" {
                charString = "Tab"
            } else if charString == "\b" {
                charString = "BackSpace"
            } else{
                doXDoTool("type", charString)
                continue
            }
            // key is required for special characters
            err = doXDoTool("key", charString)
            continue
        }
        continue
    } else {
        doXDoTool("type", message_string)
    }
    continue
} else if strings.HasPrefix(message_string, "{kb_cmd:kxdotool}:") {
    message_string = strings.TrimPrefix(message_string, "{kb_cmd:kxdotool}:")
    if message_string == "" {
        message_string = "\n"
    }
    doXDoTool("key", message_string)
    continue
}

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