Revit changes for DynamoCore split

The related changes for https://github.com/DynamoDS/Dynamo/pull/2143


User_local.props defines DYNAMOAPI as ..\Dynamo\bin\... We expect that those who will work on DynamoRevit can work with installed Dynamo as well, otherwise based on how he has structured his repo he needs to update this path in user_local.props