Menu hotkeys step2. Reacting to hotkeys. Now the hotkeys are functional.

- Added sesnitivity to hotkeys AKA highlighted symbols
- Marked up all menu data with hotkeys

Remaining
- Refactor for cleanup
- Test non-Latin hotkeys
? Extend the implemented  hotkeys to use with shortcuts (like F5 for copying), and replace existing shortcut mechanism
Merge pull request #77 from helgp/master-0.16.2

Menu hotkeys step2. Reacting to hotkeys. Now the hotkeys are functional.