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.
mavproxy: automatically restore console and map after Ctrl-C
modules: removed unusued module methods
only call unload if module has unload attribute