Add ZeroTier standard .clang-format -- Keeping tabs for 1.X line. Mostly based on LLVM format.

.clang-format

@@ -0,0 +1,75 @@
+---
+BasedOnStyle: LLVM
+BreakBeforeBraces: Stroustrup
+IndentWidth: 4
+TabWidth: 4
+AlignAfterOpenBracket: AlwaysBreak
+AlignConsecutiveMacros: 'true'
+AlignConsecutiveAssignments: 'false'
+AlignConsecutiveDeclarations: 'false'
+AlignEscapedNewlines: Right
+AlignOperands: 'true'
+AlignTrailingComments: 'true'
+AllowAllArgumentsOnNextLine: 'false'
+AllowAllConstructorInitializersOnNextLine: 'false'
+AllowAllParametersOfDeclarationOnNextLine: 'false'
+AllowShortBlocksOnASingleLine: 'true'
+AllowShortCaseLabelsOnASingleLine: 'false'
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: Never
+AlwaysBreakAfterReturnType: None
+BinPackArguments: 'false'
+BinPackParameters: 'false'
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeTernaryOperators: 'true'
+BreakConstructorInitializers: BeforeComma
+BreakInheritanceList: BeforeComma
+CompactNamespaces: 'false'
+ConstructorInitializerAllOnOneLineOrOnePerLine: 'true'
+ConstructorInitializerIndentWidth: '4'
+ContinuationIndentWidth: '4'
+Cpp11BracedListStyle: 'false'
+FixNamespaceComments: 'true'
+IncludeBlocks: Regroup
+IndentCaseLabels: 'true'
+IndentPPDirectives: None
+IndentWrappedFunctionNames: 'false'
+KeepEmptyLinesAtTheStartOfBlocks: 'false'
+MaxEmptyLinesToKeep: '1'
+NamespaceIndentation: None
+PointerAlignment: Left
+ReflowComments: 'true'
+SortIncludes: 'true'
+SortUsingDeclarations: 'true'
+SpaceAfterCStyleCast: 'false'
+SpaceAfterLogicalNot: 'true'
+SpaceAfterTemplateKeyword: 'true'
+SpaceBeforeAssignmentOperators: 'true'
+SpaceBeforeCpp11BracedList: 'true'
+SpaceBeforeCtorInitializerColon: 'true'
+SpaceBeforeInheritanceColon: 'true'
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: 'true'
+SpaceInEmptyParentheses: 'false'
+SpacesBeforeTrailingComments: '3'
+SpacesInAngles: 'false'
+SpacesInCStyleCastParentheses: 'false'
+SpacesInContainerLiterals: 'true'
+SpacesInParentheses: 'false'
+SpacesInSquareBrackets: 'false'
+UseTab: 'Always'
+
+---
+Language: Cpp
+Standard: Cpp03
+ColumnLimit: '240'
+---
+Language: ObjC
+ColumnLimit: '240'
+---
+Language: Java
+ColumnLimit: '240'
+---
+Language: CSharp
+ColumnLimit: '240'
+...