Per XLS-0095, we are taking steps to rename ripple(d) to xrpl(d).
This change specifically removes all copyright notices referencing Ripple, XRPLF, and certain affiliated contributors upon mutual agreement, so the notice in the LICENSE.md file applies throughout. Copyright notices referencing external contributions remain as-is. Duplicate verbiage is also removed.
We're currently calling `XXH3_createState` and `XXH3_freeState` when hashing an object. However, it may be slow because they call `malloc` and `free`, which may affect the performance. This change avoids the use of the streaming API as much as possible by using an internal buffer.
