Fix issue where IFTTT menu was not visible

[datakurre]

@Shriyanshagro

The first commit in this pull was the reason why your new menu was not visible. You accidentally copied also the interface that was supposed to link the menu adapters with "Plone content menu".

51c1f47

I cannot blame you on this, because this whole menu framework is very well documented (well, it is documented in "Zope 3 framework" book, but its integration with Plone not so much).

The third commit disables the current IFTTT items in action menu and creates a new action group connected to IFTTT menu. It allows us to populate IFTTT menu from actions.xml:

affe60a

The second and last commit are mostly just clean up.

[coveralls]

Pull Request Test Coverage Report for Build 270

• 7 of 15 (46.67%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+1.1%) to 88.114%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/collective/ifttt/browser/menu.py	7	15	46.67%

Files with Coverage Reduction	New Missed Lines	%
src/collective/ifttt/browser/menu.py	1	52.5%

Totals
Change from base Build 265:	1.1%
Covered Lines:	341
Relevant Lines:	387

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💛 - Coveralls

[datakurre]

@Shriyanshagro You may merge this to your branch once you are familiar with the changes (this is pull request to your branch, not master).