Custom/plural property name for implicit collections

[las-nsc]

When you have a sequence without a surrounding element, the name of the XSD class is used, for example

<House>
  <Person Name="Mum"/>
  <Person Name="Dad"/>
  <Person Name="Son"/>
  <Person Name="Daughter"/>
  <Object Name="Bed"/>
  <Object Name="Sofa"/>
  <Object Name="Table"/>
  <Object Name="Bath"/>
</House>

Would generate 2 C# collections, but they will be called Person and Object rather than People and Objects

If we could specify a custom xsd attribute to override the name of this sequence collection, or embed it in a comment, that would be much better.

[mganss]

This is similar to #159.