Allow user to use standard Shiny inputs, but with ... so additional attributes can be used
| 1 2 | 
| type | Type of Shiny input | 
| inputId | The  | 
| label | Display label for the control, or  | 
| value | Initial value. | 
| width | The width of the input, e.g.  | 
| placeholder | A character string giving the user a hint as to what can be entered into the control. Internet Explorer 8 and 9 do not support this option. | 
| class | CSS class | 
| ... | Additional attributes passed to Shiny input | 
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