Improved compatibility with update_field

Signed-off-by: Elliot Condon <e@elliotcondon.com>
Improved JS bug causing loss of data in select field

Signed-off-by: Elliot Condon <e@elliotcondon.com>
Improved update_value function for post object fields

Signed-off-by: Elliot Condon <e@elliotcondon.com>