refactor and initial implementation of scheduled_cmds

* Now the state is stored in a single file at $GSB_STATE_FILE.
* Fixed some typos.
* Commands are now functions in a dict.
	The sender_number, the args, and the whole message are passed to
	the command functions.
* for each scheduled command a name, the command args and the
	timestamp of the last execution are stored.
* datetime.timedelta objects are used to check if a scheduled cmd should run

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