Add keyboard shortcuts

[ri0t]

The first one (alt-u for user actions) is already in there. What else should be added a) for the framework and b) for some of the modules?

• [ ] Help (F1 Can we override these???)
  • [ ] Contextual help (ctrl-f1?)
• [x] Extend Statusbar (alt-~?)
• [x] Feature Menu (F2 s.a.)
• [ ] Lock (alt-l?)
• [ ] Focus global search (alt-s?)
• [ ] Focus local limit (alt-l?)
• [x] Hide nav/sidebars/statusbar (alt-h?)
• [ ] Language selector? (alt-i?)
• [ ] Infoscreen management?

Finer control via ctrl-alt:

• [x] Enable debug mode immediately (ctrl-alt-d)
• [ ] Show login-dialog (ctrl-alt-l)
• [x] Log out (ctrl-alt-o)