CRM-20610: 'Payment Edit' form improvements

[monishdeb]

Overview

The Payment Edit form improvements:

1. Modified payment fields like credit-card-type, pan_truncation and check_number as optional fields.
2. Added medium-popup to payment-edit action link to minimize the payment edit form size. But there's a limitation - if you open a popup form inside a popup form, that special class has no effect on the form size. Please check the screencast here.
3. Shifted the action link from left to right.
4. Added payment_instrument_id and trxn_id fields in payment edit form
5. Added formRule validation and added rule for pan_truncation to be numeric
6. Changed the credit_card_type icon field to card_type_id select field.
7. Used addField to render some FinancialTrxn fields.

Screencast

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• CRM-20610: Replace payment details block with editable payment list on 'Edit Contribution' form

[monishdeb]

@JoeMurray @eileenmcnaughton I have moved few changes from #10776 into this PR along with other improvements mentioned in the PR description.

[colemanw]

Looks good.