`Json::Object` and related objects are not used at all, so this change removes `include/xrpl/json/Object.h` and all downstream files. There are a number of minor downstream changes as well.
Full list of deleted classes and functions:
* `Json::Collections`
* `Json::Object`
* `Json::Array`
* `Json::WriterObject`
* `Json::setArray`
* `Json::addObject`
* `Json::appendArray`
* `Json::appendObject`
The last helper function, `copyFrom`, seemed a bit more complex and was actually used in a few places, so it was moved to `LedgerToJson.h` instead of deleting it.
This change renames all occurrences of `namespace ripple` and `ripple::` to `namespace xrpl` and `xrpl::`, respectively, as well as the names of test suites. It also provides a script to allow developers to replicate the changes in their local branch or fork to avoid conflicts.
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.
The codebase is filled with includes that are unused, and which thus can be removed. At the same time, the files often do not include all headers that contain the definitions used in those files. This change uses clang-format and clang-tidy to clean up the includes, with minor manual intervention to ensure the code compiles on all platforms.
