[XProxy] Added EditUrlDialog.
[XProxy] Added EditUrlsDialog.
[XProxy] Proper operator< for proxies.
[XProxy] Proxy manipulation in ProxiesStorage.
[XProxy] Proper settings in ProxyStorage.
[XProxy] Use the storage in ProxiesConfigWidget.
[XProxy] op== for Proxy.
[XProxy] Sanity check in UpdateProxy().
[XProxy] Don't load proxies in ProxiesStorage ctor.
[XProxy] Clear proxies list on LoadSettings().