1. Removed dependencies on $gateway->id in the database which made the codebase fairly brittle in places. Use the name field of payment_gatway instead.
2. Refactored Event Checkout so that in theory it should be a lot easier to add other Omnipay gateways.
3. Removed Paypal Express as a gateway supported by default.
4. Payment Gateways are now configurable by specifying an admin and checkout template in the database directly.
5. Broke each payment option out into its own template instead of trying to handle all payment gateways in one form with funny if conditions.
6. Account settings for Payment Gateways is now dynamic based on what is in the database.
7. Added migration and updated Seeder to make sure the payment_gateways is correct on in stall and when upgrading.
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