[PaymentBundle] When marking invoice as paid, add option to capture a payment
[PaymentBundle] Change payment method selection to use select2
[PaymentBundle] Only show public payment methods to non-loggedin users
[PaymentBundle] Use select2 for payment method form
[CoreBundle] Add checkbox class to checkbox fields
[PaymentBundle] Set default status to payment
[PaymentBundle] Use original password when saving payment method instead of saving it as NULL