formatter: add support for suffix/prefix to the image formatter (#3011)
formatter: add support for suffix/prefix to the image formatter (#3011)

I found that the image formatter required a full URL to the image. 
In my experience images were well organized /something/<productid> , so I wish I were able to reuse that id field to display the image. Just need to add the prefix/suffix.

Bonus: Some CDN and application frameworks support automated resizing of images by adding something like ?width=123. This can be used easily with a suffix.

Usage:

```
        {title:"image", field:"id", width:120, formatter:"image", formatterParams:{urlPrefix:"/images/product/", urlSuffix:".jpg", width:"100%"},
        {title:"otherimage", field:"id", width:120, formatter:"image", formatterParams:{urlSuffix:"?w=256", width:"100%"},
```
olifolkerd/tabulator