JS API Refactor Acceptance Conditions

[rajsite]

Things we should review across all the api functions implemented to make consistent prior to submission:

• [ ] Input validation of valueRef
• [ ] Robustness of stackSave / restore and error recovery the api should enable
• [ ] Input validation responsibility or JS layer vs vs CPP layer (ie validate array of numbers for dimensions iput or value of string for readString)
• [ ] Consistent marking of parameters as const on the CEntryPoints
• [ ] Validation of the TypeManager input in CEntryPoint functions (null check or better)
• [x] Modify findValueRef and findSubValueRef to return undefined if path does not resolve to a value instead of throwing - update lookupLocalBindingInfo in Mainline