Modularize handlers

[zeroone2numeral2]

All handlers should be in a dedicated handlers/ directory where we initialize all handlers and then we import it in the main file

import handlers.santa_buttons
import handlers.private
...

dispatcher.add_handler(handlers.private.start)
dispatcher.add_handler(handlers.private.help)
dispatcher.add_handler(handlers.santa_buttons.start_match)
...

eg. handlers/private.py

def on_start_command(update, context):
  pass

start = CommandHandler("start", on_start_command)