#21 Restructure node/subnode events

[Todd Pierzina]

Standardize events that fire for a node and subnode:
- Remove deprecated eventListeners property
- Rename SubNode events to TargetBeginVersionExport, TargetEndVersionExport, etc.
- TargetBeginNodeImport fires at start of entire node; TargetEndNodeImport fires at end of entire node
- Version events fire before and after each version, INCLUDING the top node's version

[Nobody/Anonymous]

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