Renamed DynamoRevitApp and DynamoRevit

Changes
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* Renamed IExternalApplication "DynamoRevitApp" to "DynamoRevitAppDS"
* Renamed IExternalCommand "DynamoRevit" to "DynamoRevitDS"

This is so that the loaded "DynamoRevitApp/DynamoRevit" from the Master add-in do not conflict with the ones in ChocoButter.