refactor: Remove unnecessary copyright notices already covered by LICENSE.md

[bthomee]

High Level Overview of Change

This change removes superfluous copyright notices in source and header files. It also provides a script to allow developers to replicate the changes in their local branch or fork to avoid conflicts.

Context of Change

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 (many thanks to Vinnie Falco and Howard Hinnant for being flexible), so the notice in the LICENSE.md file applies throughout. Copyright notices referencing external contributions, e.g. from Bitcoin, remain as-is. Duplicate verbiage is also removed.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Performance (increase or change in throughput and/or latency)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• Release

[bthomee]

@dangell7 FYI - note the base branch, which should allow me to merge them all one after another once approval has been given to all of them.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (bthomee/rename_definitions@154d6fa). Learn more about missing BASE report.

Additional details and impacted files

@@                     Coverage Diff                      @@
##             bthomee/rename_definitions   #5929   +/-   ##
============================================================
  Coverage                              ?   78.5%           
============================================================
  Files                                 ?     817           
  Lines                                 ?   69017           
  Branches                              ?    8268           
============================================================
  Hits                                  ?   54209           
  Misses                                ?   14808           
  Partials                              ?       0           

Files with missing lines	Coverage Δ
include/xrpl/basics/BasicConfig.h	88.6% <ø> (ø)
include/xrpl/basics/Buffer.h	100.0% <ø> (ø)
include/xrpl/basics/ByteUtilities.h	100.0% <ø> (ø)
include/xrpl/basics/CompressionAlgorithms.h	0.0% <ø> (ø)
include/xrpl/basics/CountedObject.h	100.0% <ø> (ø)
include/xrpl/basics/DecayingSample.h	88.6% <ø> (ø)
include/xrpl/basics/Expected.h	100.0% <ø> (ø)
include/xrpl/basics/IntrusivePointer.h	91.7% <ø> (ø)
include/xrpl/basics/IntrusivePointer.ipp	87.4% <ø> (ø)
include/xrpl/basics/IntrusiveRefCounts.h	92.8% <ø> (ø)
... and 196 more

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