Add configuration files for dev environment

- clang-format options that I like
- cquery config that worked in another project
- some .gitignore
- a shell.nix file

.clang-format

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+---
+BasedOnStyle: Mozilla
+AlignAfterOpenBracket: AlwaysBreak
+AlignConsecutiveAssignments: 'false'
+AlignConsecutiveDeclarations: 'false'
+AlignEscapedNewlines: DontAlign
+AlignOperands: 'false'
+AlignTrailingComments: 'false'
+AllowAllParametersOfDeclarationOnNextLine: 'true'
+AllowShortBlocksOnASingleLine: 'true'
+AllowShortCaseLabelsOnASingleLine: 'true'
+AllowShortFunctionsOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: 'true'
+AllowShortLoopsOnASingleLine: 'true'
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: 'true'
+BinPackArguments: 'true'
+BinPackParameters: 'true'
+BreakBeforeBraces: Mozilla
+BreakBeforeTernaryOperators: 'true'
+BreakStringLiterals: 'false'
+DerivePointerAlignment: 'false'
+IncludeBlocks: Regroup
+IndentCaseLabels: 'true'
+IndentPPDirectives: None
+IndentWidth: '2'
+IndentWrappedFunctionNames: 'false'
+KeepEmptyLinesAtTheStartOfBlocks: 'false'
+Language: Cpp
+PointerAlignment: Left
+ReflowComments: 'false'
+SpaceAfterCStyleCast: 'false'
+SpaceBeforeAssignmentOperators: 'true'
+SpaceInEmptyParentheses: 'false'
+SpacesInCStyleCastParentheses: 'false'
+SpacesInParentheses: 'false'
+SpacesInSquareBrackets: 'false'
+TabWidth: '2'
+UseTab: ForContinuationAndIndentation
+
+...

.cquery

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+%clang
+%c -std=gnu99
+
+-I./src
+-I.

.gitignore

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+*.o
+*.gcov
+*.gcno
+*.gcda
+
+*.tar.gz
+*.tgz
+*.gz
+*.zip
+
+*.png
+*.ps
+*.pdf
+

shell.nix

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+/* 
+ * This file is a nix expression which can be used to get an isolated
+ * development environemt.
+ *
+ * When the nix package manager is installed run 
+ *  > nix-shell ./scripts/dev-env.nix 
+ * to get a shell with the dependenies of veriT present. This was only tested
+ * on NixOS, but should work on other platforms which are supported by the Nix
+ * packagemanger (such as MacOS X) too.
+ */
+
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.stdenv.mkDerivation {
+  name = "hvif-light";
+
+  hardeningDisable = [ "all" ];
+  buildInputs = with pkgs; [ autoconf automake gcc clang-tools ];
+
+}