Libraries wishlist

[yhql]

There are quite a few parsers and functionalities that are found in many different apps, and that we would benefit from having within the SDK directly, under our control and tests, and provide to external developers instead of letting them recode their own.

Parsers/encoders (may all need adaptation with PIC until a loader is implemented):

• Nanopb (protocol buffers)
• CBOR
• Base58
• Base64
• Bech32
• BIP44
• RLP

Helpers:

• Uint256 (https://docs.soliditylang.org/en/v0.5.3/types.html ?)
  • From Clang-11, can use _ExtInt(256)
• Embedded sprintf / snprintf / printf https://github.com/mpaland/printf

Basic functionality fixes:

• speculos semihosting debug feature (something like speculos_dbg("blah %s", "x");)
• A more standard printf function
  • Footgunny custom formatter
  • Cardano mentions the non-standard return of snprintf causing some problems
  • Hedera reimplemented their own vsnprintf

Please provide more when you catch them and I'll edit this issue.