PhetioIDUtils and Tandem Naming Conventions

PhetioIDUtils (from scenerystack/tandem) provides static helpers for building and inspecting PhET-iO element IDs (phetioID paths produced by a tandem tree). Naming conventions (camelCase segments, Property suffixes, …) matter only when publishing a stable PhET-iO API.

SceneryStack apps that omit instrumentation never need these utilities. See PhET-iO and Instrumentation and Tandem.