Pull in Allman's rules so modifications to BraceWrapping actually do something instead of being ignored because BreakBeforeBraces isn't set to Custom

.clang-format

@@ -12,6 +12,7 @@ AllowShortBlocksOnASingleLine: false
 AllowShortCaseLabelsOnASingleLine: true
 AllowShortFunctionsOnASingleLine: All
 AllowShortIfStatementsOnASingleLine: false
+AllowShortLambdasOnASingleLine: All
 AllowShortLoopsOnASingleLine: false
 AlwaysBreakAfterDefinitionReturnType: None
 AlwaysBreakAfterReturnType: None
@@ -19,24 +20,22 @@ AlwaysBreakBeforeMultilineStrings: false
 AlwaysBreakTemplateDeclarations: false
 BinPackArguments: true
 BinPackParameters: true
-BraceWrapping:   
-  AfterClass:      false
-  AfterControlStatement: false
-  AfterEnum:       false
+BraceWrapping:
+  AfterCaseLabel: true
+  AfterClass:      true
+  AfterControlStatement: Always
+  AfterEnum:       true
   AfterFunction:   true
-  AfterNamespace:  false
-  AfterObjCDeclaration: false
-  AfterStruct:     false
-  AfterUnion:      false
-  #AfterExternBlock: false
-  BeforeCatch:     false
-  BeforeElse:      false
-  IndentBraces:    false
-  #SplitEmptyFunction: true
-  #SplitEmptyRecord: true
-  #SplitEmptyNamespace: true
+  AfterNamespace:  true
+  AfterObjCDeclaration: true
+  AfterStruct:     true
+  AfterUnion:      true
+  AfterExternBlock: true
+  BeforeCatch:     true
+  BeforeElse:      true
+  BeforeLambdaBody: true
 BreakBeforeBinaryOperators: All
-BreakBeforeBraces: Allman
+BreakBeforeBraces: Custom
 BreakBeforeInheritanceComma: false
 BreakBeforeTernaryOperators: true
 BreakConstructorInitializersBeforeComma: false
@@ -65,6 +64,7 @@ IncludeCategories:
     Priority:        1
 IncludeIsMainRegex: '(Test)?$'
 IndentCaseLabels: true
+IndentExternBlock: AfterExternBlock
 IndentPPDirectives: None
 IndentWidth:     4
 IndentWrappedFunctionNames: false
@@ -95,6 +95,6 @@ SpacesInContainerLiterals: true
 SpacesInCStyleCastParentheses: false
 SpacesInParentheses: false
 SpacesInSquareBrackets: false
-Standard:        c++17
+Standard:        c++20
 TabWidth:        4
 UseTab:          Never