libs: remove commented and unneeded code (#3757)

- libs/errors: commented out errors.go
- libs/common: unused colors.go
- libs/db: unused debugDB

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

libs/common/colors.go

@@ -1,95 +0,0 @@
-package common
-
-import (
-	"fmt"
-	"strings"
-)
-
-const (
-	ANSIReset      = "\x1b[0m"
-	ANSIBright     = "\x1b[1m"
-	ANSIDim        = "\x1b[2m"
-	ANSIUnderscore = "\x1b[4m"
-	ANSIBlink      = "\x1b[5m"
-	ANSIReverse    = "\x1b[7m"
-	ANSIHidden     = "\x1b[8m"
-
-	ANSIFgBlack   = "\x1b[30m"
-	ANSIFgRed     = "\x1b[31m"
-	ANSIFgGreen   = "\x1b[32m"
-	ANSIFgYellow  = "\x1b[33m"
-	ANSIFgBlue    = "\x1b[34m"
-	ANSIFgMagenta = "\x1b[35m"
-	ANSIFgCyan    = "\x1b[36m"
-	ANSIFgWhite   = "\x1b[37m"
-
-	ANSIBgBlack   = "\x1b[40m"
-	ANSIBgRed     = "\x1b[41m"
-	ANSIBgGreen   = "\x1b[42m"
-	ANSIBgYellow  = "\x1b[43m"
-	ANSIBgBlue    = "\x1b[44m"
-	ANSIBgMagenta = "\x1b[45m"
-	ANSIBgCyan    = "\x1b[46m"
-	ANSIBgWhite   = "\x1b[47m"
-)
-
-// color the string s with color 'color'
-// unless s is already colored
-func treat(s string, color string) string {
-	if len(s) > 2 && s[:2] == "\x1b[" {
-		return s
-	}
-	return color + s + ANSIReset
-}
-
-func treatAll(color string, args ...interface{}) string {
-	parts := make([]string, 0, len(args))
-	for _, arg := range args {
-		parts = append(parts, treat(fmt.Sprintf("%v", arg), color))
-	}
-	return strings.Join(parts, "")
-}
-
-func Black(args ...interface{}) string {
-	return treatAll(ANSIFgBlack, args...)
-}
-
-func Red(args ...interface{}) string {
-	return treatAll(ANSIFgRed, args...)
-}
-
-func Green(args ...interface{}) string {
-	return treatAll(ANSIFgGreen, args...)
-}
-
-func Yellow(args ...interface{}) string {
-	return treatAll(ANSIFgYellow, args...)
-}
-
-func Blue(args ...interface{}) string {
-	return treatAll(ANSIFgBlue, args...)
-}
-
-func Magenta(args ...interface{}) string {
-	return treatAll(ANSIFgMagenta, args...)
-}
-
-func Cyan(args ...interface{}) string {
-	return treatAll(ANSIFgCyan, args...)
-}
-
-func White(args ...interface{}) string {
-	return treatAll(ANSIFgWhite, args...)
-}
-
-func ColoredBytes(data []byte, textColor, bytesColor func(...interface{}) string) string {
-	s := ""
-	for _, b := range data {
-		if 0x21 <= b && b < 0x7F {
-			s += textColor(string(b))
-		} else {
-			s += bytesColor(fmt.Sprintf("%02X", b))
-		}
-	}
-	return s
-}