Renamed "AsyncTask.ExecuteCore" to "HandleTaskExecutionCore"
Renamed "NodeModel.RequestVisualUpdate" to "RequestVisualUpdateAsync"
Introduced an empty "NodeModel.RequestValueUpdateAsync" method
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into NameChange
Merge pull request #2978 from Benglin/NameChange

Update names to comply with convention