Add documents

Add documents, document views and a document store to manage document and which one is displayed.

• The MainWindow make calls to the VivyDocumentStore to create the documents and the views
• The VivyDocumentStore create the documents
• The VivyDocumentView is only here to have a view, it won't hold any data
• The VivyDocument can be manipulated in any part of the code
• Widgets view the VivyDocument through the VivyDocumentView
• Add the VivyApplication that will hold the window and the non-graphic data
• The main window can get the currently selected main document

src/VivyDocument.h

@@ -21,7 +21,7 @@ public:
 private:
     /* The document name */
     QString documentName;
-    QDir documentLocation{ QDir::currentPath() };
+    QDir documentLocation{ QDir::current() };
 
     /* The type to get all fields, has audio, etc... */
     int documentType{ 0 };