S3 bucket listing support and network code refactors.

* Adds support for listing all objects in an S3 bucket.
* Renames a bunch of network related classes (Download->Action)
* Net actions now have static constructors

logic/net/FileDownload.cpp

@@ -6,7 +6,7 @@
 
 
 FileDownload::FileDownload ( QUrl url, QString target_path )
-	:Download()
+	:NetAction()
 {
 	m_url = url;
 	m_target_path = target_path;