Add a filter for Billable Status to the "import committed cost transactions" in Change Orders

Have found a problem with Cos that are non-billable:

Cost-plus With GMP project: in a CO, ‘Import Committed Cost Transactions’ doesn’t respect the billable status of the incoming items. Non-billable items are imported into the CO resulting in an incorrect CO value, and ultimately mis-billing to the customer on the final invoice when billing adjustments are made to take the project to 100%.