Add support for mattermost threading

[patcon]

This is untested, as I don't have access to a mattermost instance.

[codeclimate]

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[42wim]

@patcon thanks for the initiative :-) I'll test asap on an instance

[42wim]

Almost works. You need to actually set the ParentID though :)

Add ParentID: message.Post.ParentId, below:

matterbridge/bridge/mattermost/handlers.go

Lines 101 to 108 in a2754f1

	rmsg := &config.Message{
	Username: message.Username,
	UserID: message.UserID,
	Channel: message.Channel,
	Text: message.Text,
	ID: message.Post.Id,
	Extra: make(map[string][]interface{}),
	}

[42wim]

@patcon are you going to fix this PR with the mattermost issue or should I open a new one for this?

[ghost]

Found some fixes!

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