True 64-bit Integers in JS Implementation

[MTrop]

Currently, the math in JS TAME is using Number, which works for 64-bit floats, but not integers, whose precision is capped to 53 bits (highest representable whole number in IEEE 754 float).

Must employ either a BigInt or String-like solution for integers. Will require overhauling lots of the TValue.js calculating functions, plus how TValue objects store its data.