* Shrink Value_Header to improve utilization of memory.
  * When refCounter reaches its maximum, the object is immortalized to
    avoid overflow. This immotalization is also used to represent
    statically allocated stock objects.
  * Prepare some commonly seen values and share it to improve memory usage.
  * Added debug code to dump memory stats.

* Commonly seen values such as integers less than 100 are predefined and shared.
* Constant String, Int64, Bits64 and Double values are allocated statically as
  indestructible and shared.

Refactor constantName function to return Core String type
and handle unsupported types by throwing InternalError exception.

Co-authored-by: Mathew Polzin <[email protected]>

…cky-value