Move QVariant -> Media conversion from MediaContainer to Media

Also, just convert from within the method, instead of silently adding
the media to the container

src/Library/Library.cpp

@@ -72,7 +72,10 @@ void
 Library::postLoad()
 {
     for ( const auto& var : m_settings->value( "medias" )->get().toList() )
-        createMediaFromVariant( var );
+    {
+        auto m = Media::fromVariant( var );
+        addMedia( m );
+    }
 
     for ( const auto& var : m_settings->value( "clips" )->get().toList() )
         createClipFromVariant( var, nullptr );

src/Library/MediaContainer.cpp

@@ -193,13 +193,6 @@ MediaContainer::count() const
     return m_clips.size();
 }
 
-Media*
-MediaContainer::createMediaFromVariant( const QVariant& var )
-{
-    Media* m = addMedia( QFileInfo( var.toString() ) );
-    return m;
-}
-
 Clip*
 MediaContainer::createClipFromVariant( const QVariant &var, Clip* parent )
 {

src/Library/MediaContainer.h

@@ -121,7 +121,6 @@ protected:
 
     Clip*                   m_parent;
 
-    Media*          createMediaFromVariant( const QVariant& var );
     Clip*           createClipFromVariant( const QVariant& var, Clip* parent );
 
 public slots:

src/Media/Media.cpp

@@ -32,6 +32,7 @@
 #endif
 
 #include <QUrl>
+#include <QVariant>
 
 #include "Media.h"
 
@@ -123,6 +124,11 @@ Media::input() const
     return m_input.get();
 }
 
+Media* Media::fromVariant( const QVariant& v )
+{
+    return new Media( QFileInfo( v.toString() ).absoluteFilePath() );
+}
+
 void
 Media::setFilePath( const QString &filePath )
 {

src/Media/Media.h

@@ -101,6 +101,8 @@ public:
     Backend::IInput*         input();
     const Backend::IInput*   input() const;
 
+    static Media* fromVariant( const QVariant& v );
+
 #ifdef HAVE_GUI
     // This has to be called from the GUI thread.
     QPixmap&                    snapshot();