option to always show menu items

it has been discussed in the past to not hide menus by default but that was rejecetd, though an option to show them always show them *might* be added if someone is willing for a patch with tests.

I'll take this one since looks like I've got working solution - just a little bit more personal checking/testing is needed and then patch will be is on the way.

bzr branch with fix committed : https://code.launchpad.net/~iaz/unity/menubar-lp789979

How to test modifications

Install patched version of Unity (Precise only):
$ sudo add-apt-repository ppa:iaz/unity
$ sudo apt-get update && sudo apt-get install unity

Install CompizConfig Settings Manager:
$ sudo apt-get install compizconfig-settings-manager

Change settings in Unity:
 - run CompizConfig:
$ ccsm
 - navigate to Ubuntu Unity Plugin -> Experimental and set up "Menus fade-out duration" to 0
 - restart session (log out and log in)
 - now may the menu bar be with you

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I've had requests for this feature for the builds on my PPA (Unity-revamped). I've come up with a solution which you guys can see here: https://code.launchpad.net/~ikarosdev/unity/5.0_unity-revamped (commits: 2367 & 2638).

Essentially, I used the code from anton0 (branch linked above) to add an option to CCSM. From there, I did my best to emulate the behavior described in this bug. Currently, it works like this:

- For unmaximized windows, the title will always be cut-off.
- For maximized windows, the title will not be visible; however, the window controls and menu will be visible.

If the option is disabled (via CCSM), the default behavior will return.

So far, I'm not having any issues with it.