Add any-event(all event) mouse tracking (DECSET 1003)

Unicode Editor Mined(http://towo.net/mined/) uses ALL_EVENT_MOUSE mode to track mouse hover events on its menu item.
Now this cool feature works in some terminals, such as MinTTY, cygwin console, gnome-terminal ...etc..
So I write this patch that makes iTerm2 also support ALL_EVENT_MOUSE.