add contribution status to the civicontribute product feature.
upgrade hook to migrate civievent product feature status into serialized array.
upgrade hook specifies default for civicontribute status on all existing features.
civicontribute and civievent product feature forms allow setting a different CRM status for each order state.
store civicrm entity ID for each order product id.
synchronize contribution status with order status.
synchronize event participation status with order status.

the same order can have multiple contributions, and the contribution's invoice_id must be unique.

For CiviContribute, total_amount is still the full price for the product. In
addition, the fee_amount, net_amount and non_deductible_amount are part of the
product feature.

For CiviEvent, the status and role are configureable.