Proposed 2.2.0-b2

[ximinez]

High Level Overview of Change

This is a beta for the 2.2.0 release.

Highlights:

• 4327

• 4781

• 4950

• 4763

• 4933

The base branch is release. All releases (including betas) go in release. This PR will be merged with --ff-only (not squashed or rebased, and not using the GitHub UI) to both release and develop.

Context of Change

This introduces

• the fast base58 codec, which speeds up base58 encoding and decoding significantly
• a user version of the feature RPC command, allowing lookups without changing voting settings
• the fixEmptyDID amendment to prevent creation of empty DID objects
• the fixXChainRewardRounding amendment to improve the calculation of reward shares
• consensus improvements to reduce de-syncs

It also fixes up some technical debt and build issues, and fixes the 'install' target so that downstream projects like clio can build properly.

Type of Change

• [x] Release

API Impact

No API impact.

[Bronek]

Important caveat - because of https://github.com/XRPLF/rippled/pull/4893 , we have added a conan dependency on xxHash::xxhash xxhash::xxhash, which is transitive for users of libxrpl . We could hide this dependency if we think it's a problem - i.e. move implementation of class xxhasher from header to .cpp so the dependency #include <xxhash.h> does not show up in header file xxhasher.hpp (which is seen in the library interface)

[ximinez]

@Bronek What is the worst case for users of libxrpl once they bump their dependency to this version or later? I assume they'd have to re-run conan install. Maybe wipe out their build directory?

[Bronek]

@Bronek What is the worst case for users of libxrpl once they bump their dependency to this version or later? I assume they'd have to re-run conan install. Maybe wipe out their build directory?

re-running conan install will be definitely needed; luckily it does not rebuild anything that's already in conan cache, so it should be quick, no need to wipe anytihing. The bigger problem is for projects which depend in libxrpl, as they will also (transitively) gain this dependency, without necessarily knowing about it. So they will also have to re-run conan install

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.93172% with 342 lines in your changes are missing coverage. Please review.

Project coverage is 76.96%. Comparing base (d7d15a9) to head (c88166e). Report is 3 commits behind head on release.

Files	Patch %	Lines
src/test/basics/base58_test.cpp	80.20%	29 Missing and 10 partials :warning:
src/ripple/rpc/handlers/GetAggregatePrice.cpp	82.71%	13 Missing and 15 partials :warning:
src/ripple/app/tx/impl/SetOracle.cpp	85.00%	9 Missing and 15 partials :warning:
src/ripple/protocol/impl/token_errors.h	17.24%	24 Missing :warning:
src/ripple/protocol/impl/tokens.cpp	89.32%	9 Missing and 10 partials :warning:
src/ripple/app/tx/impl/DeleteOracle.cpp	55.00%	11 Missing and 7 partials :warning:
src/test/jtx/impl/Oracle.cpp	88.38%	12 Missing and 6 partials :warning:
src/ripple/app/paths/impl/AMMOffer.cpp	40.74%	15 Missing and 1 partial :warning:
src/ripple/protocol/impl/b58_utils.h	78.78%	6 Missing and 8 partials :warning:
src/ripple/rpc/handlers/LedgerEntry.cpp	58.62%	8 Missing and 4 partials :warning:
... and 32 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release #4979 +/- ## ============================================ + Coverage 61.53% 76.96% +15.43% ============================================ Files 797 1129 +332 Lines 70158 131913 +61755 Branches 36261 39628 +3367 ============================================ + Hits 43170 101527 +58357 - Misses 19753 24464 +4711 + Partials 7235 5922 -1313 ```

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