Core:Ajax: Align nonce & global with master, fix an AMD issue

Core:Ajax: Align nonce & global with master, fix an AMD issue

This commit aligns the `3.x-stable` branch with `master` in two aspects:
1. It migrates the nonce module to return an object instead of a primitive
variable. This had to be changed on `master` as in ES modules you export
live read-only bindings to variables, meaning you can't increment the nonce
directly. Also, the way it was done so far was working differently in AMD & the
single built file - in the built file one nonce variable was declared, accessed
and incremented. In AMD mode separate instances were create for each module
that depend on the nonce module, creating unintended nonce clashes.
2. Whether the `noGlobal` parameter was set to `true` is now checked using the
typeof operator to align with `master`.

Closes gh-4612
Ref gh-4541
Ref d0ce00cdfa680f1f0c38460bc51ea14079ae8b07