Add linting + formatting

.clang-format

+---
+Language: Json
+DisableFormat: false
+IndentWidth: 4
+---
+BasedOnStyle: WebKit
+Language: Cpp
+Standard: Cpp11
+
+IndentWidth: 4
+SpacesBeforeTrailingComments: 1
+TabWidth: 8
+UseTab: Never
+ContinuationIndentWidth: 4
+MaxEmptyLinesToKeep: 3
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeColon
+BreakConstructorInitializersBeforeComma: true
+
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterClass: true
+  AfterControlStatement: false
+  AfterEnum: true
+  AfterFunction: true
+  AfterNamespace: false
+  AfterObjCDeclaration: false
+  AfterStruct: true
+  AfterUnion: false
+  BeforeCatch: false
+  BeforeElse: false
+  IndentBraces: false
+
+ForEachMacros:
+  - forever # avoids { wrapped to next line
+  - foreach
+  - Q_FOREACH
+
+AccessModifierOffset: -4
+ConstructorInitializerIndentWidth: 4
+AlignEscapedNewlinesLeft: false
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: false
+AllowShortEnumsOnASingleLine: false # requires clang-format 11
+AlignAfterOpenBracket: true
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: true
+BinPackParameters: true
+ColumnLimit: 100
+Cpp11BracedListStyle: true
+DerivePointerBinding: false
+ExperimentalAutoDetectBinPacking: false
+IndentCaseLabels: false
+NamespaceIndentation: None
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 60
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+PointerBindsToType: false
+SpaceAfterTemplateKeyword: false
+IndentFunctionDeclarationAfterType: false
+SpaceAfterControlStatementKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceInEmptyParentheses: false
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: true
+SpacesInParentheses: false
+...

.clang-tidy

+Checks: '
+    -*,
+
+    bugprone-*,
+    -bugprone-narrowing-conversions,
+    -bugprone-integer-division,
+    -bugprone-parent-virtual-call,
+    -bugprone-macro-parentheses,
+
+    performance-*,
+    -performance-no-automatic-move,
+
+    readability-avoid-const-params-in-decls,
+    readability-const-return-type,
+    readability-container-size-empty,
+    readability-inconsistent-declaration-parameter-name,
+    readability-isolate-declaration,
+    readability-redundant-member-init,
+    readability-redundant-smartptr-get,
+    readability-simplify-boolean-expr,
+    readability-use-anyofallof,
+    -readability-make-member-function-const,
+    -readability-qualified-auto,
+
+    cppcoreguidelines-init-variables,
+    cppcoreguidelines-interfaces-global-init,
+    cppcoreguidelines-prefer-member-initializer,
+    cppcoreguidelines-pro-type-cstyle-cast,
+    cppcoreguidelines-pro-type-member-init,
+    cppcoreguidelines-pro-type-reinterpret-cast,
+    cppcoreguidelines-slicing,
+    cppcoreguidelines-special-member-functions,
+
+    google-build-explicit-make-pair,
+    google-explicit-constructor,
+
+    misc-misplaced-const,
+    misc-redundant-expression,
+    misc-throw-by-value-catch-by-reference,
+
+    modernize-concat-nested-namespaces,
+    modernize-loop-convert,
+    -modernize-make-shared,
+    modernize-make-unique,
+    modernize-redundant-void-arg,
+    modernize-replace-random-shuffle,
+    modernize-use-auto,
+    modernize-use-emplace,
+    modernize-use-equals-default,
+    modernize-use-nullptr,
+    modernize-use-override,
+    modernize-use-using,
+    '
+CheckOptions:
+    - key: cppcoreguidelines-special-member-functions.AllowSoleDefaultDtor
+      value: True
+    - key: cppcoreguidelines-special-member-functions.AllowMissingMoveFunctionsWhenCopyIsDeleted
+      value: True

.codespellrc

+[codespell]
+skip = ./build-*,.git
+interactive = 3