Straight forward port from QJson to the native Json support.
As a note I have added 2 helper functions that make the code bit more
readable (object2qvariant and qvariatn2qobject).
Now protocol version is only sent once (in the identity package)
Removed "isEncrypted" bit, using type "kdeconnect.encrypted" instead.
NetworkPackage's decrypt and unserialize return false when find problems
Updated tests.
Fixed some bugs in the pairing process state machine
Keys are now stored in base64 in KConfig (was storing non-allowed chars)
Updated NetworkPackage tests to include encryption
Increased networkpackage version 1 -> 2