Refactor menu missing from Visual Studio 2015
You no longer need to access the refactoring using the mouse right click.
It is recommended that you use the keyboard shortcut keys within Visual Studio.
For all possible shortcut keys, see Default Keyboard Shortcuts in Visual Studio, Refactor.
Some of the refactoring tools have been relocated or are at least accessible in a different manner than they were previously.
Using the extract method refactor as an example, you can still use this function; it is just not done the same as before:
Right click
Quick actions
Click extract Method
I think they've changed it to feel more "ReSharper"ey. All of the functionality should still be there however.
Here's more information on refactoring in Visual Studio 2015 - hopefully this helps! Refactoring (C#)