- remove `<input>` tags and add contenteditable attribute to all
editable cells
- rows are always enabled now (no "edit" button to enable them)
- Simplify javascript code:
- use classNames to simplify column selection, instead of unique ids
- use datatables "columnDefs" and "createdCell" to add attributes
- use CSS class "editing" and CSS rules to handle buttons
- remove unused and unnecessary attributes from elements
Signed-off-by: RD WebDesign <github@rdwebdesign.com.br>