Update .clang-format file

Changes include:
- updates for newer clang-format versions
- Align across comments
- Set C++ version to C++17
- Don't split empty functions, etc.
- Left align reference and pointer operators
- Don't indent name spaces

.clang-format

 ---
+# to be used on clang-format version 14 or later
 Language:        Cpp
-# BasedOnStyle:  LLVM
 AccessModifierOffset: -2
 AlignAfterOpenBracket: Align
-AlignConsecutiveAssignments: true
-AlignConsecutiveDeclarations: true
-AlignEscapedNewlines: Right
-AlignOperands:   true
+AlignConsecutiveAssignments: AcrossComments
+AlignConsecutiveBitFields: AcrossComments
+AlignConsecutiveDeclarations: AcrossComments
+AlignConsecutiveMacros: AcrossComments
+AlignEscapedNewlines: Left
+AlignOperands:   Align
 AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: false
 AllowAllParametersOfDeclarationOnNextLine: false
-AllowShortBlocksOnASingleLine: true
+AllowShortBlocksOnASingleLine: Always
 AllowShortCaseLabelsOnASingleLine: false
+AllowShortEnumsOnASingleLine: false
 AllowShortFunctionsOnASingleLine: All
-AllowShortIfStatementsOnASingleLine: false
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLambdasOnASingleLine: All
 AllowShortLoopsOnASingleLine: false
-AlwaysBreakAfterDefinitionReturnType: None
 AlwaysBreakAfterReturnType: None
 AlwaysBreakBeforeMultilineStrings: false
-AlwaysBreakTemplateDeclarations: false
+AlwaysBreakTemplateDeclarations: No
 BinPackArguments: true
 BinPackParameters: true
-BraceWrapping:   
+BraceWrapping:
+  AfterCaseLabel:  true
   AfterClass:      true
-  AfterControlStatement: true
+  AfterControlStatement: Always
   AfterEnum:       true
   AfterFunction:   true
   AfterNamespace:  true
-  AfterObjCDeclaration: false
+  AfterObjCDeclaration: true
   AfterStruct:     true
   AfterUnion:      true
   AfterExternBlock: true
   BeforeCatch:     true
   BeforeElse:      true
+  BeforeLambdaBody: true
+  BeforeWhile:     false
   IndentBraces:    false
   SplitEmptyFunction: false
   SplitEmptyRecord: false
   SplitEmptyNamespace: false
 BreakBeforeBinaryOperators: NonAssignment
-BreakBeforeBraces: Allman
+BreakBeforeBraces: Custom
 BreakBeforeInheritanceComma: false
+BreakInheritanceList: BeforeColon
 BreakBeforeTernaryOperators: true
-BreakConstructorInitializersBeforeComma: true
 BreakConstructorInitializers: BeforeComma
 BreakAfterJavaFieldAnnotations: false
 BreakStringLiterals: true
@@ -55,21 +62,30 @@ DerivePointerAlignment: false
 DisableFormat:   false
 ExperimentalAutoDetectBinPacking: false
 FixNamespaceComments: true
-ForEachMacros:   
+ForEachMacros:
   - foreach
   - Q_FOREACH
   - BOOST_FOREACH
 IncludeBlocks:   Preserve
-IncludeCategories: 
+IncludeCategories:
   - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
     Priority:        2
+    SortPriority:    0
+    CaseSensitive:   false
   - Regex:           '^(<|"(gtest|gmock|isl|json)/)'
     Priority:        3
+    SortPriority:    0
+    CaseSensitive:   false
   - Regex:           '.*'
     Priority:        1
+    SortPriority:    0
+    CaseSensitive:   false
 IncludeIsMainRegex: '(Test)?$'
 IndentCaseLabels: false
+IndentCaseBlocks: true
+IndentGotoLabels: false
 IndentPPDirectives: None
+IndentExternBlock: NoIndent
 IndentWidth:     2
 IndentWrappedFunctionNames: true
 JavaScriptQuotes: Leave
@@ -78,7 +94,7 @@ KeepEmptyLinesAtTheStartOfBlocks: false
 MacroBlockBegin: ''
 MacroBlockEnd:   ''
 MaxEmptyLinesToKeep: 1
-NamespaceIndentation: All
+NamespaceIndentation: None
 ObjCBinPackProtocolList: Auto
 ObjCBlockIndentWidth: 2
 ObjCSpaceAfterProperty: false
@@ -90,25 +106,30 @@ PenaltyBreakFirstLessLess: 120
 PenaltyBreakString: 1000
 PenaltyExcessCharacter: 1000000
 PenaltyReturnTypeOnItsOwnLine: 60
-PointerAlignment: Right
+PointerAlignment: Left
 ReflowComments:  true
 SortIncludes:    false
 SortUsingDeclarations: true
 SpaceAfterCStyleCast: true
+SpaceAfterLogicalNot: false
 SpaceAfterTemplateKeyword: false
 SpaceBeforeAssignmentOperators: true
+SpaceBeforeCaseColon: false
 SpaceBeforeCtorInitializerColon: true
 SpaceBeforeInheritanceColon: true
 SpaceBeforeParens: ControlStatements
+SpaceAroundPointerQualifiers: Default
 SpaceBeforeRangeBasedForLoopColon: false
+SpaceInEmptyBlock: false
 SpaceInEmptyParentheses: false
 SpacesBeforeTrailingComments: 3
-SpacesInAngles:  false
+SpacesInAngles: false
+SpacesInConditionalStatement: false
 SpacesInContainerLiterals: true
 SpacesInCStyleCastParentheses: false
 SpacesInParentheses: false
 SpacesInSquareBrackets: false
-Standard:        Cpp11
+Standard:        c++17
 TabWidth:        8
 UseTab:          Never
 ...