DE2131 Order Create Add '<PayPalPayerInfo>' Node

Add logistics in order create to add the '<PayPalPayerInfo>'
node under the `OrderCreateRequest/Context` parent node
when the ROM Payment Extension is enabled and the payment
method for the order is 'PayPal'.

Conflicts:

	src/app/code/community/EbayEnterprise/Eb2cOrder/Model/Create.php
DE2169 Always Return DateTime from getMessageDate

Makes eb2ccore/feed helper's getMessageDate always return a DateTime
object. Will use the CreateDateAndTime from the XML feed message header
if possible but will fall back to the feed file's mtime and finally just
use the unix time 0 if all else fails.

Slight refactor of getMessageDate method to make it more obvious what is
happening, reduce cyclomatic complexity and allow creating the DateTime
from the extracted times more testable.

Conflicts:
	src/app/code/community/EbayEnterprise/Eb2cCore/Helper/Feed.php
DE2169 Fix Method Name