Update clang-format to version 11

This is taken from the Godot repository, so formatting is similar. This
updates the style rules as well.

Also fix style in files to conform with this version.

.clang-format

@@ -13,9 +13,9 @@ AlignAfterOpenBracket: DontAlign
 AlignTrailingComments: false
 AllowAllParametersOfDeclarationOnNextLine: false
 # AllowShortBlocksOnASingleLine: false
-AllowShortCaseLabelsOnASingleLine: true
+# AllowShortCaseLabelsOnASingleLine: false
 AllowShortFunctionsOnASingleLine: Inline
-AllowShortIfStatementsOnASingleLine: true
+# AllowShortIfStatementsOnASingleLine: false
 # AllowShortLoopsOnASingleLine: false
 # AlwaysBreakAfterDefinitionReturnType: None
 # AlwaysBreakAfterReturnType: None
@@ -76,7 +76,7 @@ IndentWidth:     4
 # IndentWrappedFunctionNames: false
 # JavaScriptQuotes: Leave
 # JavaScriptWrapImports: true
-# KeepEmptyLinesAtTheStartOfBlocks: true
+KeepEmptyLinesAtTheStartOfBlocks: false
 # MacroBlockBegin: ''
 # MacroBlockEnd:   ''
 # MaxEmptyLinesToKeep: 1
@@ -112,10 +112,11 @@ UseTab:          Always
 ---
 ### C++ specific config ###
 Language:        Cpp
-Standard:        Cpp03
+Standard:        Cpp11
 ---
 ### ObjC specific config ###
 Language:        ObjC
+Standard:        Cpp11
 ObjCBlockIndentWidth: 4
 # ObjCSpaceAfterProperty: false
 # ObjCSpaceBeforeProtocolList: true
@@ -123,4 +124,5 @@ ObjCBlockIndentWidth: 4
 ### Java specific config ###
 Language:        Java
 # BreakAfterJavaFieldAnnotations: false
+JavaImportGroups: ['org.godotengine', 'android', 'androidx', 'com.android', 'com.google', 'java', 'javax']
 ...