moved non-session classes out of session package
connection classes moved to connection package
made separate classes for connection listeners
removed password from heap
login dialog remembers last server used
added reconnect handler to prompt user to re-login after disconnect
Former-commit-id: 6f7851d8c4 [formerly 8ab1bab974] [formerly 6b22374046 [formerly 762e7d3a1ff47f794aa843d2b159ac78b4ab12a3]]
Former-commit-id: 6b22374046
Former-commit-id: 7cf5f06f2a