[Templates] Handling of templates from older Dynamo versions

[andydandy74]

Any templates that need migrating apparently cannot be copied to a new HomeWorkspace. One possible approach: compare the workspace version with the app version and prompt the user to upgrade (i.e. save) their template or cancel.

[andydandy74]

Another idea: Serialize / deserialize.

[andydandy74]

And another idea: pen, save to temporary location, copy, close, delete temporary copy