Still has some cleaning up to do, but usable datatables.

• loading from URL
• loading from json array
• pagenation
• column sorting
• column toggling: show or hide column
• searching
• editing rows

• I think splitting the thead, tbody, tfoot, and pagination functions to their own functions would be better than having them all in the render function.
• Remove all id's so we're not constrained to using them
• use svg for sorting icons
• formatting with editing columns
• option to use modal for editing column
• more testing
• switch to use pico dropdowns for column toggling
• when editing a date / time column use browser datetime input type