Adding clang-format script

All the code in zenity from now, will follow this format style

.clang-format

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+---
+BasedOnStyle: GNU
+AlignAfterOpenBracket: DontAlign
+AlignConsecutiveAssignments: 'false'
+AlignConsecutiveDeclarations: 'false'
+AlignOperands: 'false'
+AlignTrailingComments: 'false'
+AllowAllParametersOfDeclarationOnNextLine: 'false'
+AllowShortBlocksOnASingleLine: 'false'
+AllowShortCaseLabelsOnASingleLine: 'false'
+AllowShortFunctionsOnASingleLine: 'None'
+AllowShortLoopsOnASingleLine: 'false'
+AllowShortIfStatementsOnASingleLine: 'false'
+BinPackArguments: 'false'
+BinPackParameters: 'true'
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Attach
+BreakBeforeTernaryOperators: 'true'
+BreakConstructorInitializersBeforeComma: 'true'
+Cpp11BracedListStyle: true
+ColumnLimit: '80'
+ConstructorInitializerAllOnOneLineOrOnePerLine: 'true'
+IndentCaseLabels: 'true'
+Language: Cpp
+NamespaceIndentation: None
+PointerAlignment: Right
+SortIncludes: 'true'
+SpaceAfterCStyleCast: 'true'
+Standard: Cpp03
+IndentWidth: 4
+TabWidth: 4
+UseTab: Always
+...
+

utils/format.sh

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+#!/bin/bash
+find src -type f \( -iname '*.c' -or -iname '*.h' \) -exec clang-format -i -style=file {} \;
+