Add Replace in... to context menus

Add "Replace in..." to project tree and working set context menus.

https://trello.com/c/3cKG28Fn/1309-replace-in-from-file-tree

cc @njx 

It doesn't look like this is actually being used, so I don't think this test is actually testing the functionality. I think you need to pass it into the call to `openSearchBar()` below.