add a .clang-format for Qemu style plus various fixes

Based on bab9fdd5d1/.clang-format

.clang-format

@@ -0,0 +1,113 @@
+# Style based on https://gist.github.com/elmarco/aa5e0b23567f46fb7f0e73cde586a0c1
+# Discussion: https://lore.kernel.org/all/1443720628-16512-1-git-send-email-marcandre.lureau@redhat.com/
+#
+# See also:
+# https://clang.llvm.org/docs/ClangFormat.html
+# https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+---
+Language:        Cpp
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: true
+AlignArrayOfStructures: Right
+AlignConsecutiveDeclarations: true
+AlignConsecutiveMacros: true
+AlignTrailingComments: true
+AlignEscapedNewlinesLeft: true
+AlignOperands: true
+AlignTrailingComments: true
+AlignConsecutiveBitFields: true
+
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterReturnType: None # AlwaysBreakAfterDefinitionReturnType is taken into account
+AlwaysBreakBeforeMultilineStrings: false
+BinPackArguments: true
+BinPackParameters: false
+
+BreakBeforeBinaryOperators: None #NonAssignment
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: false
+BreakStringLiterals: true
+
+BraceWrapping:   
+  AfterControlStatement: MultiLine # need for multi-line if() {
+  AfterEnum:       false
+  AfterFunction:   true
+  AfterStruct:     false
+  AfterUnion:      false
+  BeforeElse:      false
+  IndentBraces:    false
+
+DerivePointerAlignment: false
+PointerAlignment: Right
+ReferenceAlignment: Right
+SpaceAroundPointerQualifiers: Default
+
+# CommentPragmas:  '^ IWYU pragma:'
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: false
+DisableFormat:   false
+ForEachMacros:   [
+  'CPU_FOREACH',
+  'CPU_FOREACH_REVERSE',
+  'CPU_FOREACH_SAFE',
+  'IOMMU_NOTIFIER_FOREACH',
+  'QLIST_FOREACH',
+  'QLIST_FOREACH_ENTRY',
+  'QLIST_FOREACH_RCU',
+  'QLIST_FOREACH_SAFE',
+  'QLIST_FOREACH_SAFE_RCU',
+  'QSIMPLEQ_FOREACH',
+  'QSIMPLEQ_FOREACH_SAFE',
+  'QSLIST_FOREACH',
+  'QSLIST_FOREACH_SAFE',
+  'QTAILQ_FOREACH',
+  'QTAILQ_FOREACH_REVERSE',
+  'QTAILQ_FOREACH_SAFE',
+  'QTAILQ_RAW_FOREACH',
+  'RAMBLOCK_FOREACH'
+]
+IncludeCategories: 
+  - Regex:           '^"qemu/osdep.h'
+    Priority:        -3
+  - Regex:           '^"(block|chardev|crypto|disas|exec|fpu|hw|io|libdecnumber|migration|monitor|net|qapi|qemu|qom|standard-headers|sysemu|ui)/'
+    Priority:        -2
+  - Regex:           '^"(elf.h|qemu-common.h|glib-compat.h|qemu-io.h|trace-tcg.h)'
+    Priority:        -1
+  - Regex:           '.*'
+    Priority:        1
+IncludeIsMainRegex: '$'
+IndentCaseLabels: false
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: '.*_BEGIN$' # only PREC_BEGIN ?
+MacroBlockEnd:   '.*_END$'
+MaxEmptyLinesToKeep: 2
+
+ColumnLimit:     85
+PenaltyExcessCharacter: 10
+PenaltyBreakAssignment: 10
+PenaltyBreakBeforeFirstCallParameter: 200
+PenaltyReturnTypeOnItsOwnLine: 200
+PenaltyBreakFirstLessLess: 400
+PenaltyBreakComment: 500
+PenaltyBreakString: 500
+
+ReflowComments:  true
+SortIncludes:    true
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInContainerLiterals: true
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard:        Auto
+UseTab:          Never
+...

.clang-format-ignore

@@ -0,0 +1,2 @@
+nyx/khash.h
+nyx/mmh3.c