tracker: fixed for use in SITL
map: fixed for create_vehicle_icon in tracker
fixed flight mode update for tracker
flight mode is in HEARTBEAT for v1.0 mavlink
rally: Add unload method.
fence: add unload method
log: add unload method
console: Console window now closes when module is unloaded.
map: Map window now closes when module is unloaded.
mavproxy: Now catches Ctrl-C and requires 'exit' to quit.
mavproxy: requireexit setting added.  Ctrl-C only caught if set.