title: Path to the project current dir in qt
body: <p>I want to get a path to the project directory in Qt and reference the other files of my project relative to it. I know this issue have been already discussed here
  <a href="https://stackoverflow.com/questions/7402576/get-current-working-directory-in-a-qt-application">Get current working directory in a Qt application</a>
  and here 
  <a href="https://stackoverflow.com/questions/17646700/how-to-get-current-working-directory-path-of-a-qt-application">How to get current working directory path of a Qt application?</a>
  but the answer is still unknown. In case it's impossible to get such a path then what is the approach of navigation among files of the Qt project.</p>