Added data to the callback through use of menu.context. See
interface/contextmanagers.py for an example in the function
click_callback. It sets up the context menu's context data based on what
was right clicked so that, when the menu command is executed, it performs
the callback and passes that data through the callback. Currently,
whenever an address is right clicked, you can select either of the options
and it will print all of the tags on stdout.
Removed unnecessary file
Added basic double click bindings that will print out what has been double
clicked in the strings and the functions listboxes.