title: Acessing currently opened solution in a vsix project
body: <p>I want to access the path to currently open solution in Visual Studio from a vsix project. How can I get that?</p>
  
  <p><a href="https://stackoverflow.com/questions/15685715/is-there-a-way-to-detect-whether-or-not-there-is-an-opened-solution-in-vs-2012-f">This thread tells if a solution is open</a>  or not but gives nothing about the path of the opened solution</p>