Disabled changing toolbar color with `auxwindow` as it only works for the dropdown.
Added `GetProjectTree`, `GetWatch`, and `GetStack` package calls (#166).
Fixed `F2` shortcut not working in file tree and watch panel (#233).

This is a workaround for a conflict between global shortcuts and local
shortcuts (like F2) used in the file tree or a watch panel.
Because of several issues on OSX (as described in details in this thread:
https://groups.google.com/d/msg/wx-dev/juJj_nxn-_Y/JErF1h24UFsJ),
the workaround installs a global event handler that manually re-routes
conflicting events when the current focus is on a proper object.
Non-conflicting shortcuts are handled through key-down events.