Make new menu the default menu
There's a new menu layout in this version of the software. It was implemented as a plugin in 0.9.x to avoid clashes with existing themes, but we're going to break that compatibility in this version, so we're just going for it. This change involved moving all the changes in NewMenuPlugin into the default code that was calling it. In addition, since accountsettingsaction and connectsettingsaction differed only by menu, I removed them, changed all references to them to the settingsmenu, and moved the combined nav to its own class. Let's put that episode behind us. The CSS shim that was loaded by NewMenuPlugin for certain themes and certain actions was removed.
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