HBox 布局

基本用法

```schema: scope=”body” [ { “type”: “hbox”, “className”: “b-a bg-dark lter”, “columns”: [ { “type”: “plain”, “text”: “Col A”, “columnClassName”: “wrapper-xs b-r” },

        "Col B"
    ]
},
{
    "type": "hbox",
    "className": "b-a m-t bg-dark lter",
    "columns": [
        {
            "type": "plain",
            "text": "w-md",
            "columnClassName": "w-md wrapper-xs bg-primary b-r"
        },
        "..."
    ]
}

] ```

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