Add Omemo-Support to Chatty#3

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meisterlampe wants to merge 4 commits intomariohock:masterfrom

meisterlampe:omemo

Commits on Mar 10, 2020

Register plugin & echo some plain msg for omemo
meisterlampe
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Commits on Mar 11, 2020

Commits on Mar 18, 2020

Set License to GPL
meisterlampe
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