Function FriendRow 

fn FriendRow(props: FriendRowProps) -> impl IntoView

列表的一行：把手、头像、名称与状态、主机、排序值与编辑。

Required Props

• link: FriendLink
• index: usize
• count: impl Into<Signal<usize>>
• editing: impl Into<Signal<bool>>
• dragging: impl Into<Signal<bool>>
• drop_target: impl Into<Signal<bool>>
• on_edit: impl Into<Callback<FriendLink>>
• on_move: [impl Into<Callback<(usize, usize)>>](Callback<(usize, usize)>)
• on_drag: impl Into<Callback<Option<usize>>>
• on_over: impl Into<Callback<usize>>
• on_drop: impl Into<Callback<usize>>