Improve the implementation and use of the IsVisibleInDynamoLibrary attribute
Merge branch 'ChocoButter-2Become1' of github.com:DynamoDS/Dynamo into ChocoButter-2Become1
Merge pull request #1330 from Randy-Ma/ChocoButter-2Become1

Improve the implementation and use of the IsVisibleInDynamoLibrary attribute