STYLE: Replace ptr = new T; memset(ptr, 0, sizeof(T)) with new T()

Simplified code by replacing

    ptr = new T;
    memset(ptr, 0, sizeof(T))

with `ptr = new T()`.

Modules/Core/Common/test/itkFixedArrayTest2.cxx

@@ -38,11 +38,7 @@ itkFixedArrayTest2(int, char *[])
   // Declare an array of nelements FixedArray
   // and add a small margin to play with pointers
   // but not map outside the allocated memory
-  auto * vec = new ArrayType[nelements + 8];
-
-  // Fill it up with zeros
-  memset(vec, 0, (nelements + 8) * sizeof(ArrayType));
-
+  auto * vec = new ArrayType[nelements + 8]();
 
   // Display the alignment of the array
   std::cout << "Initial alignment: " << (((size_t)vec) & 7) << '\n';

Modules/IO/GE/src/itkGE5ImageIO.cxx

@@ -180,8 +180,7 @@ GE5ImageIO::ReadHeader(const char * FileNameToRead)
                                                         << "Reason: " << reason);
   }
 
-  curImage = new GEImageHeader;
-  memset(curImage, 0, sizeof(GEImageHeader));
+  curImage = new GEImageHeader();
 
   std::ifstream f;
   this->OpenFileForReading(f, FileNameToRead);