adds fedocal support

[rowright8]

Adds !nextmeeting and !nextmeetings
I am not entirely sure that the test classes are working 100% for the messages for multi line. Any suggestions appreciated.

[ryanlerch]

Thanks so much for the PR!

Just thinking, I have been trying to use the subcommands to logically group our commands. Not 100% sold on this, but maybe something like:

!calendar nextmeetings

and then just do the alias thing similar to what we do here:

maubot-fedora/fedora/infra.py

Lines 52 to 63 in e508639

	async def alias_oncall(self, evt: MessageEvent, match) -> None:
	msg, cmd, arguments = match
	if cmd != "oncall":
	return
	if arguments:
	await evt.respond(
	"`!oncall` is an alias to `!infra oncall list` please use "
	"the `!infra oncall` command for changing the oncall list"
	)
	return
	await self._get_oncall(evt)

itll be a lot simpler, just a straight alias to !nextmeetings and !nextmeeting (the idea behind this is to have the aliases more hidden for compatibility purposes i.e. not in the !help )

Also, i think we can reduce this down to a single command too (!nextmeeting and !nextmeetings) doing the same thing, being:

1.Show (if any) meetings scheduled for the room the command was called in
2. Show the scheduled meetings for all upcoming rooms.

The idea here being having two seperate commands is a bit of overkill, and just outputting all the info is not that bad, because there is really not that much.

[ryanlerch]

#50