[w3c/payment-request] Modifiers and [[serializedMethodData]] not actually used anywhere. (#753)

Following on from #684, there are a bunch of huge issues in the spec relating to modifiers:

 * [[serializedMethodData]] is not actually used anywhere - it's undefined how that data actually gets applied/displayed.
 * [[serializedMethodData]] gathers all the data from EVERY modifier (without matching on PMI!), then passes ALL data to the chosen payment handler - in the spec, there is no way to distinguish between data for ApplePay and data for Basic-Card.  
 * The modifiers in `serializedMethodData` are never converted, only serialized, meaning that if they are  converted by the payment handler, they can throw: This is undefined behavior.  
 * The actual serialization also seems pointless. If that's for IPC, then that should be an implementation detail. It doesn't seem to serve any purpose in the spec (because [[serializedMethodData]] is never actually used for anything). 

I'm again strongly inclined towards dropping modifiers in favor of something else. They are super broken, underspecified, and unnecessarily complicated. 


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