[ClangFormat] Add test checkking indentation after Q_OBJECT

Added test checking behavior when after Q_OBJECT all class structure
have correct indenting and redundent tabs doesn't appear before key words
such as  public:, private: , etc.
Made automatic addition Qt defines to StatementMacro to .clang-format files.

Fixes: QTCREATORBUG-26776
Change-Id: I3490421a9caf2831b593939597940358f7ce8f01
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/clangformat/tests/clangformat-test.h

@@ -109,6 +109,7 @@ private slots:
     void testSortIncludes();
     void testChainedMemberFunctionCalls();
     void testCommentBlock();
+    void testClassIndentStructure();
 
 private:
     void insertLines(const std::vector<QString> &lines);