Use new base58 parser (Version: 2.1.0)

[godexsoft]

Summary

rippled introduced a new, faster parser for base58: XRPLF/rippled#4327

Motivation

15x faster than the previous implementation. It shows about 10% speedup for RPC commands in rippled and should be for Clio too.

Solution

Use the new parser.

Paths Not Taken

• Write our own parser.
• Use a library
• Leave as is

[cindyyan317]

Link with #88

[godexsoft]

Looks like nothing to do in Clio in order to support this.
The fast algorithm is automatically used when compiled outside of MSVC (relies on __int128 found in both gcc and clang).
Clio already uses libxrpl's base58 functions and does not use other 3rd party library for this nor introduces a custom parser for base58.