ConnMan: Add Advanced Settings Dialog
ConnMan: Fix focus issue with the extension

The extension dialog for passphrase entry does not get invoked since
the panel holds the focus. Un grabbing the focus solves this issue.
ConnMan: Launch Advanced Settings dialog

Launch Advanced setting dialog when the settings icon is clicked.
ConnMan: Add Details panel

Add details notebook page in the connection editor.
ConnMan: Add Proxy configuration page
ConnMan: Add IPv4 configuration page
ConnMan: Add IPv6 configuration page
ConnMan: Add Domains configuration page
ConnMan: Add Nameservers configuration page