Streamline Python file headers somewhat

- Add coding statement
  - Import all modules in one line where possible
  - Order: __future__, typing, plain imports, from imports,
    janware modules

Signed-off-by: Jan Lindemann <jan@janware.com>

tools/python/jwutils/log.py

@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+
 from __future__ import print_function
 
 from typing import List, Tuple, Optional, Any
@@ -6,6 +8,7 @@ import sys, re, io, syslog, inspect
 
 from os.path import basename
 from datetime import datetime
+
 from . import misc
 
 # --- python 2 / 3 compatibility stuff