Rework connection loss handling in SPMySQL, particularly to improve background loss of connections:

 - Attempt to fix a condition causing a reconnection loop by fixing the order of connection state check and a query variable
 - If a connection is lost in the background, only attempt a single reconnect instead of requiring user intervention at once
 - Add a new connection state to handle background disconnects
 - If the connection has been lost in the background but is about to be used, reconnect it automatically (informing the user of loss if appropriate)
 - Don't attempt background reconnections if the connection has not been used for some time
(Also update localisable strings, and tweak navigator controller connection usage)

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