prevent traceback when we click on Rename in accounts window, but no account is selected. Fixes #5019

Add a second timeout to differenciate keepalive and ping alive packets. We now wait 55s before sending a keepalive (whitespace packet) and 2 minutes before sendind a xmpp ping (and then we wait for 1min the answer before reconnecting) Fixes #4643

correctly create session (pm / not pm) when we send a message in a control without a session (after disabling E2E). Fixes #4818

change background of editable cells in default status message treeview and make columns resizable. Fixes #4746