DataTables: Update to version 1.10.3.
Add support for the WP WXR exporter/importer.
During export, add the table IDs for the exported `tablepress_table` posts into a pseudo post meta field.
During import, use those table IDs to restore the mapping from table ID to post ID in the `tablepress_tables` WP Option.
See https://github.com/TobiasBg/TablePress/issues/17.
Add some missing `array` PHP type hints
"Edit" screen: Remove box-shadows and transitions only from text fields, but not buttons, checkboxes, etc.