US15708 Use 'Unsubmitted' Status to Resend Orders

Add upgrade script to install 'unsubmitted' order status.
Set initial order state to 'New' and status to 'Unsubmitted'.
Set order status to pending when ROM API return 'success'.
Set Order status to unsubmitted when transient error occurs.
Filter order retry by state 'new' and status 'unsubmitted'.
Update documentation.
US15627 Add Order Event XSDs
Consistent Include Pattern
US15705 Implementing Backodered Functionality

Add 'Order Status Event Management' in admin configuration section.
Add order status for backorder dropdown.
Add eb2corder/observer::updateBackOrderStatus to listen to
'ebayenterprise_order_event_back_order' event.
Add eb2corder/data::extractOrderEventIncrementId helper method to extract
increment_id from message xml.
Add documentation.
US15713 Listen to Order Status Rejected Event

Add rejected status in admin configuration.
Observer the 'ebayenterprise_order_event_rejected' event.
Add logic to update order status and state.
DE1847 Product Export Fails XSD

* Ensure that the default store is processed first explicitly, and explain why.
* Should default store find invalid items, remove those items from the productId
  list so that subsequent stores don't try to reprocess.
DE1889 Verbiage Changes to Order Status

Revert the verbiage to what was specified in the
original user stories.
DE1760 Order Retry XML Missing

Check that the OrderCreateRequest attribute is non-empty before attempting to send. If it is empty, log at warn level and leave status unchanged.
Update Troubleshooting Guide with this information.
DE1884 Remove 'null' Value From 'CharSet' Node

Rename eb2corder/create::_xsdString method to eb2corder/
create::_restrictText method and change the return signature
to return a DOMText node with the XSD valid string.
Fix broke tests. In eb2corder/create::_buildBrowserData method
make sure to passed in the $maxLength of 50 as defined in the
XSD documentation for 'CharSet' node and null as the $default
parameter.
DE1898 Remove Dead Modman Links
Consistent Way of Logging