Create .clang-format file in lb-project-init and lb-dev

lb-project-init (as for the other generated files) use a hardcoded template for the new file if not already present. The template is a copy of .clang-format from Gaudi/v30r3.

Since a change in .clang-format may be very disruptive, projects should have it committed in the repository, the one provided by LbScripts is just a default.

OTOH lb-dev copies the .clang-format file from the upstream project, so that changes will have consistent formatting in case of a change of the default. If the upstream project does not have the style file, lb-dev uses the LbScripts default.

We may extend this MR to use @sponce Git pre-commit hook for automatic checking of the code style.

LbConfiguration/data/LHCb.clang-format

+# Copy of https://gitlab.cern.ch/gaudi/Gaudi/raw/v30r3/.clang-format
+Language:      Cpp
+BasedOnStyle:  LLVM
+AccessModifierOffset: -2
+AlignConsecutiveAssignments: true
+AlignConsecutiveDeclarations: true
+AlignEscapedNewlinesLeft: false
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortIfStatementsOnASingleLine: true
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: true
+BinPackParameters: true
+BreakBeforeBinaryOperators: false
+BreakBeforeBraces: Linux
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: true
+ColumnLimit:     120
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerBinding: false
+ExperimentalAutoDetectBinPacking: false
+IndentCaseLabels: false
+IndentFunctionDeclarationAfterType: false
+IndentWidth:     2
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: All
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 60
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+PointerBindsToType: true
+SpaceAfterControlStatementKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: true
+# Waiting for clang-5
+# SplitEmptyFunction: false
+# SplitEmptyRecord: false
+# SplitEmptyNamespace: false
+Standard:        Cpp11
+TabWidth:        8
+UseTab:          Never