Add global state switcher to Sandbox
Add global state switcher to Sandbox

evinstk/TantechEngineOriginal,evinstk/TantechEngine,evinstk/TantechEngineOriginal,evinstk/TantechEngine,evinstk/TantechEngineOriginal,evinstk/TantechEngineOriginal,evinstk/TantechEngineOriginal,evinstk/TantechEngine,evinstk/TantechEngine,evinstk/TantechEngineOriginal,evinstk/TantechEngine,evinstk/TantechEngine