Bid Modifiers - Core and Bidmgr

Update ADS to accept and pass down bid modifiers with an order. Update the AdWords API calls to set the bid modifiers during deployment. Update diffing to detect if a bid modifier has changed.

Bing has not announced bid modifiers by device but they continue to support mobile bid modifiers with the DeviceOSTargetBid structure.https://msdn.microsoft.com/en-us/library/bing-ads-campaign-management-addtargetstolibrary.aspx

Things to consider:

• Is it necessary to store the bid modifier anywhere other than the order JSON? st-tracker?