Add clang format and tidy configs

.clang-format

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+# https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+Language: Cpp
+BasedOnStyle: LLVM
+AccessModifierOffset: -4
+BreakBeforeBraces: Allman
+BreakBeforeTernaryOperators: true
+ColumnLimit: 100
+EmptyLineBeforeAccessModifier: Never
+FixNamespaceComments: false
+IncludeBlocks: Regroup
+IncludeCategories:
+  - Regex: "^<[a-z]*>"
+    Priority: 1
+  - Regex: "^<.*/.*>"
+    Priority: 2
+  - Regex: '^<.*\.hpp>'
+    Priority: 3
+  - Regex: '^<.*\.h>'
+    Priority: 4
+  - Regex: ".*"
+    Priority: 5
+IndentCaseLabels: true
+IndentPPDirectives: BeforeHash
+IndentWidth: 4
+InsertNewlineAtEOF: true
+NamespaceIndentation: All
+PointerAlignment: Left
+ReferenceAlignment: Left
+SortIncludes: CaseInsensitive
+SpaceBeforeCaseColon: true
+SpaceBeforeParens: ControlStatements

.clang-tidy

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+---
+# Enable all by default, then disable some that have either too many warnings
+# at the moment or ones that don't make sense for our codebase
+Checks: clang-diagnostic-*
+    clang-analyzer-*
+    cppcoreguidelines-*
+    modernize-*
+    hicpp-*
+    -hicpp-special-member-functions
+    -modernize-pass-by-value
+    -cppcoreguidelines-pro-bounds-constant-array-index
+    -modernize-use-trailing-return-type
+    -cppcoreguidelines-avoid-non-const-global-variables
+    -hicpp-signed-bitwise
+    -hicpp-vararg
+    -hicpp-braces-around-statements
+    -hicpp-no-array-decay
+    -cppcoreguidelines-pro-bounds-pointer-arithmetic
+    -cppcoreguidelines-non-private-member-variables-in-classes
+    -cppcoreguidelines-avoid-magic-numbers
+    -cppcoreguidelines-pro-type-vararg
+    -modernize-avoid-c-arrays
+    -cppcoreguidelines-avoid-c-arrays
+    -cppcoreguidelines-pro-bounds-array-to-pointer-decay
+    -cppcoreguidelines-narrowing-conversions
+    -clang-analyzer-deadcode.DeadStores
+WarningsAsErrors: '*'
+HeaderFilterRegex: ''
+AnalyzeTemporaryDtors: false
+...