fix(QMCv2): cipher should determine by key size

Feature: QMC v2 (JS Decoder)

feat(QMC): use static cipher instead of mask

WIP: 实验 qmc2-crypto 包

- Remove the use of `new Function` in emscripten generated code.
- This commit is a clean commit that does the same thing as aa59280f

This reverts commit aa59280f.

It generates unexpected large diff in package-lock.json.

- Remove the use of `new Function` in emscripten generated code.

(cherry picked from commit 447aab81df8de62f546101dc0370a5314a6ee345)

(cherry picked from commit 14394c0c5e613a9cafa38dba3c9040dd54beb6d0)

Now it is 2021!