Clang Tidy file for C99 (not C++) projects

.clang-tidy

---
# Configure clang-tidy for this project.
#
# Here is an explanation for why some of the checks are disabled:
#
#  -readability-function-cognitive-complexity: too many false positives with
#      clang-tidy-12. We need to disable this check in macros, and that setting
#      only appears in clang-tidy-13.
#
#  -bugprone-narrowing-conversions: too many false positives.
#
#  -bugprone-easily-swappable-parameters: too many false positives.
#
#  -bugprone-implicit-widening-of-multiplication-result: too many false positives.
#     Almost any expression of the form `2 * variable` or `long x = a_int * b_int;`
#     generates an error.
#
WarningsAsErrors: "*"
HeaderFilterRegex: ''
FormatStyle:     none
Checks: >
  -*,
  bugprone-*,
  clang-analyzer-*,
  google-*,
  misc-*,
  modernize-*,
  performance-*,
  portability-*,
  readability-*,
  -bugprone-easily-swappable-parameters,
  -bugprone-exception-escape,
  -bugprone-implicit-widening-of-multiplication-result,
  -bugprone-inc-dec-in-conditions,
  -bugprone-narrowing-conversions,
  -bugprone-reserved-identifier,
  -bugprone-unused-local-non-trivial-variable,
  -bugprone-unused-private-field,
  -bugprone-unused-raii,
  -bugprone-unused-return-value,
  -bugprone-use-after-move,
  -google-readability-braces-around-statements,
  -google-runtime-references,
  -misc-const-correctness,
  -misc-include-cleaner,
  -misc-non-private-member-variables-in-classes,
  -modernize-avoid-c-arrays,
  -modernize-return-braced-init-list,
  -modernize-use-auto,
  -modernize-use-default-member-init,
  -modernize-use-equal-delete,
  -modernize-use-nodiscard,
  -modernize-use-nullptr,
  -modernize-use-override,
  -modernize-use-trailing-return-type,
  -performance-implicit-conversion-in-loop,
  -performance-inefficient-string-concatenation,
  -performance-inefficient-vector-operation,
  -performance-move-const-arg,
  -readability-braces-around-statements,
  -readability-function-cognitive-complexity,
  -readability-identifier-length,
  -readability-magic-numbers,
  -readability-named-parameter,
  -readability-redundant-member-init,
  -readability-redundant-smartptr-get,
  -readability-redundant-string-cstr,
  -readability-simplify-redundant-casting

CheckOptions:
  - { key: readability-identifier-naming.FunctionCase,                   value: lower_case }
  - { key: readability-identifier-naming.VariableCase,                   value: lower_case }
  - { key: readability-identifier-naming.EnumCase,                       value: aNy_CasE }
  - { key: readability-identifier-naming.GlobalConstantCase,             value: aNy_CasE }
  - { key: readability-identifier-naming.StaticConstantCase,             value: lower_case }
  - { key: readability-implicit-bool-conversion.AllowIntegerConditions,  value: 1 }
  - { key: readability-implicit-bool-conversion.AllowPointerConditions,  value: 1 }
  - { key: readability-function-cognitive-complexity.IgnoreMacros,       value: 1 }