Code formatting: indentations
SpaceControlClient: track the connection status.

Implements the gloox::ConnectionListener and tracks the connection status, which can be retrieved to decide wheather a connection should be re-established.
Fix in I3C Client: Also delete the SpaceControlClient
I3C Client: add CXX11 featureset in CMakeLists
I3C Client: reconnect on connection errors
I3C Client: Wait a second before reconnect
I3C Client: add disconnect reason to error message
Merge pull request #31 from penguineer/xmpp-reconnect

I3C Client: XMPP reconnect