Be more restrictive when removing DataTables default parameters that are found in the "Custom Commands".
With this, `"order":` is no longer removed when `"orderable":` is found in the "Custom Commands" when looking for just `order`.
DataTables: Update to version 1.10.4.
Before checking if the minimum required WordPress version is installed, include an unmodified `$wp_version` to protect from other plugins/themes tempering with it.