SAM #59, #41, #37. For more see MR

Notes
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* Ticket #59 
* Ticket #41 
* Ticket #37 

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Other Stuff
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* A lot of Bugs between Message- and Handshakerelation fixed
* Client - MainBean added
* Message and Handshake refactored
* Low- Level- Security implemented (Failed login)
* Critical Handshake - Message- relation is extended by `NotAHandshakeException`.
* Messagewrapper improved (Validation- points)
* Class- Level- Validation (via `@Message`- Annotation) removed
* UnitTests improved