Add EPS and Giropay payment methods

[davdebcom]

Under "Note": https://docs.mollie.com/guides/recurring

[willemstuursma]

Thanks @davdebcom. Roughly the same as ING Home'Pay last time.

Details are already in our documentation (except link to the product page).

[davdebcom]

Received an API key from @ndijkstra that included EPS and Giropay, used that to test. Now ready to go together with plugin update 4.0.

Don't forget:

• update API PHP client to the version that supports EPS and Giropay.
• Tomas told me these payment methods don't support recurring the coming two weeks, so they extend Mollie_WC_Gateway_Abstract and not Mollie_WC_Gateway_AbstractSepaRecurring at the moment.

[davdebcom]

Done in 4.0 https://github.com/mollie/WooCommerce/commit/acdcccae3fc27e98162a2916fe9da78a9650ec71