Remove Java dependency for Encryption Key Request

Encryption Key Request is now fully processed using .NET RSA
capabilities
-> Good news, that was the last step for removing IKVM dependencies!
-> So now MCC does not need to use any external library. Yay! :)
-> MCC should now be compatible with Mono (Mac, Linux).
+ Removed no longed needed DLL files (9 MBytes!)
+ State MC 1.7.5 as a supported version.
+ Update version number to MCC 1.7.2