Api update

Small API update + get the main window as a raw pointer like the main document and the main document view. May throw a logic_error if no main window is present, i.e. the application is not in its main loop, you should not catch it and let Vivy crash...

src/Lib/Document/CRTPSubDocument.hh

@@ -49,7 +49,6 @@ public:
     }
 
     inline Type getType() const noexcept { return fileType; }
-
     inline QString getFilePath() const noexcept { return filePath; }
 };