adding unsubscription methods

[ghost]

⚠️ work in progress

Listener provides the option to stop the subscription to different channels.

[coveralls]

Pull Request Test Coverage Report for Build 166

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.9%) to 71.429%

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Totals
Change from base Build 164:	0.9%
Covered Lines:	851
Relevant Lines:	1111

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💛 - Coveralls