first cut of clang-format configuration for MAMEDEV (http://wiki.mamedev.org/index.php/MAME_Coding_Conventions)

.clang-format

AccessModifierOffset: -4
AlignEscapedNewlinesLeft: true
AlignTrailingComments: true
AllowAllParametersOfDeclarationOnNextLine: false
AllowShortFunctionsOnASingleLine: false
AllowShortIfStatementsOnASingleLine: true
AllowShortLoopsOnASingleLine: false
AlwaysBreakBeforeMultilineStrings: false
AlwaysBreakTemplateDeclarations: false
BinPackParameters: false
BreakBeforeBinaryOperators: false
BreakBeforeBraces: Allman
BreakBeforeTernaryOperators: false
BreakConstructorInitializersBeforeComma: true
ColumnLimit: 100
CommentPragmas: ''
ConstructorInitializerAllOnOneLineOrOnePerLine: false
ConstructorInitializerIndentWidth: 4
ContinuationIndentWidth: 0
Cpp11BracedListStyle: false
DerivePointerBinding: false
IndentCaseLabels: false
IndentFunctionDeclarationAfterType: false
IndentWidth: 4
Language: Cpp
MaxEmptyLinesToKeep: 2
NamespaceIndentation: None
ObjCSpaceAfterProperty: true
ObjCSpaceBeforeProtocolList: true
PenaltyBreakBeforeFirstCallParameter: 100
PenaltyBreakComment: 100
PenaltyBreakFirstLessLess: 0
PenaltyBreakString: 100
PenaltyExcessCharacter: 1
PenaltyReturnTypeOnItsOwnLine: 20
SpaceBeforeAssignmentOperators: true
SpaceBeforeParens: ControlStatements
SpaceInEmptyParentheses: false
SpacesBeforeTrailingComments: 1
SpacesInAngles: false
SpacesInCStyleCastParentheses: false
SpacesInContainerLiterals: false
SpacesInParentheses: false
Standard: Cpp11
TabWidth: 4
UseTab: Always