DRAFT: Prevent divide by zero in mulDiv:

[ximinez]

• Every call to mulDiv either uses a literal or constexpr, checks for 0, or throws on overflow.

High Level Overview of Change

Context of Change

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

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

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This change is 

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.1%. Comparing base (d9b7a26) to head (2aa9f4f).

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Additional details and impacted files

@@           Coverage Diff           @@
##           develop     #11   +/-   ##
=======================================
  Coverage     78.1%   78.1%           
=======================================
  Files          790     790           
  Lines        67913   67916    +3     
  Branches      8235    8220   -15     
=======================================
+ Hits         53032   53046   +14     
+ Misses       14881   14870   -11     

Files with missing lines	Coverage Δ
src/libxrpl/basics/mulDiv.cpp	100.0% <100.0%> (ø)
src/xrpld/app/misc/detail/TxQ.cpp	98.6% <100.0%> (ø)

... and 11 files with indirect coverage changes

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