fix complains from flake8

src/helper_msgcoding.py

@@ -2,7 +2,6 @@
 Message encoding end decoding functions
 """
 
-import string
 import zlib
 
 import messagetypes

src/network/asyncore_pollchoose.py

@@ -11,7 +11,6 @@ import select
 import socket
 import sys
 import time
-import warnings
 from errno import (
     EADDRINUSE, EAGAIN, EALREADY, EBADF, ECONNABORTED, ECONNREFUSED,
     ECONNRESET, EHOSTUNREACH, EINPROGRESS, EINTR, EINVAL, EISCONN, ENETUNREACH,

src/randomtrackingdict.py

@@ -3,7 +3,6 @@ Track randomize ordered dict
 """
 from threading import RLock
 from time import time
-from binascii import hexlify
 
 try:
     import helper_random

src/storage/sqlite.py

@@ -1,7 +1,6 @@
 """
 Sqlite Inventory
 """
-import sqlite3
 import time
 from threading import RLock
 

src/tr.py

@@ -42,7 +42,7 @@ def translateText(context, text, n=None):
         enableGUI = True
     if enableGUI:
         try:
-            from PyQt6 import QtCore, QtGui, QtWidgets
+            from PyQt6 import QtWidgets
         except Exception as err:
             print('PyBitmessage requires PyQt unless you want to run it as a daemon'
                   ' and interact with it using the API.'