☑️Using /start

Because of the modularity of the bot, it would be wrong to assign the /start command to one particular module. So, each module can register its own /start ModName command handler! This is done by overriding the start_cmd method in the module class (works only in the module class itself, not supported in extensions). The arguments are the same as for all other command handlers:

async def start_cmd(self, _, message: Message):
    """Initialize database entry for chat"""