Global Navigation Bar

[Haltroy]

Instead of rendering a global navigation bar, Yorot spawns multiple navigation bars for each tab. This eats a lot of RAM.

Mentioned in #16.

TODO:

• [x] Move the navigation bar to MainWindow.
• [x] Fix tab window
• [x] Check stuff from tab window
  • [x] URL bar
  • [x] Page Security
  • [x] Back/Forward
  • [x] Refresh/Stop
  • [x] Find
  • [x] Un/Mute

[Haltroy]

Everything except zoom feature is working.