[RAPPS] Move database source URL to settings dialog (#2792)

- Add download source in settings dialog, and apply it when download .cab file
- Now user should specify full rappmgr.cab URL
- Check if URL is vaild in settings dialog
- Move source settings to the end of struct (will refactor settings to one value per option later)

base/applications/rapps/include/winmain.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <windef.h>
+#include <wininet.h>
 
 //TODO: Separate main and settings related definitions
 struct SETTINGS_INFO
@@ -19,6 +20,9 @@ struct SETTINGS_INFO
     INT Proxy;
     WCHAR szProxyServer[MAX_PATH];
     WCHAR szNoProxyFor[MAX_PATH];
+    /* Software source settings */
+    BOOL bUseSource;
+    WCHAR szSourceURL[INTERNET_MAX_URL_LENGTH];
 };
 
 typedef SETTINGS_INFO *PSETTINGS_INFO;