Polyfill nodejs crypto with noble

[Duddino]

Abstract

Quite a few of our libraries use the crypto module, which is only available on nodejs.
Prior to this PR we were using the crypto-browserify. However, in #47, we decided to use the noble library, which is considerably smaller.
This also paves the way to remove bn.js and our next biggest library elliptic, which is the only remaining library which depends on it in the main bundle (Ledger also depends on bn.js, but it's in a different bundle).
This cuts down the main bundle from 419KB to 386KB (Gzipped)

Testing

Test that the polyfill works as intended.
The affected libraries were: pivx-promos, hdkey, base32

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[panleone]

importing seed phrase does not work

[panleone]

tACK

[JSKitty]

tACK d47cbcb

Tested as many wallet functions as I could: derivation of Legacy and HD, Shield and Transparent Txs, Promo Creation and Redemption, Staking and Unstaking - all is working well and the bundles reduced nicely!

[panleone]

re-tACK 9f8419a