Add a Develop menu with Nu/Vico development utilities.

[Shadowfiend]

This menu is currently toggleable like the Safari Develop menu. It contains three items:

• Reload Bundle: reloads the working directory as a bundle.
• Toggle Console: shows/hides the console (loads it if it isn't loaded yet).
• Evaluate File/Selection: evals either the current file or the current selection (when there is one).

To support the first two items, two ex commands are also added:

• :reloadbundle [path]: with no path, reloads the working directory as a bundle. Given a path, attempts to load that path as a bundle directory.
• :console: shows/hides the console (loads it if it isn't loaded yet).

This allows these same commands to be bound to keyboard shortcuts if desired.

[martinh]

looks good, will check more