Rebased on master

Addressed comments & properly handle the non-nullable columns

Addressed comments

Addressed comments

Fixed stripe tests, avoid hardcoding appname in tests (kolab now vs kolab), log error if stripe hook fails

Now with controllertests

Addressed most comments (except the controller test).

Addressed alecs comments

The payment canceling code could be removed since we're not currently offering that functionality in the UI.

• Convert chargebacks
• Don't offer payments in EUR for (until we figure out the exchange rate thing)
• Explain currency conversion if applicable
• Fixed Mollie tests (still have to go over the stripe ones)

• Whitelist payment methods and use svg icons
• Support for payments in foreign currencies (WIP):
  • We are not retrieving an exchange rate yet.
  • Initially we provide an exchange-rate to the UI to display what can be expected.
  • When initiating the payment we do the final conversion, and then store both the CHF and the payment currency amount and currency.
  • When the payment goes through we add the CHF amount as stored in the payment.
  • Caveat: On chargebacks and refunds we have to convert again, since they can be partial.
• Removed the cancel button from the UI

See comment why I'm not entirely clear why we don't require the roomStateLabel but nevertheless require a special case for 422, but looks good enough.

Looks good to me.

Works as advertised.

Addressed comments

We removed the cache instead.