Adding Roemer's Boolean Filter as a Remote Module

[lorensen (Bill Lorensen)]

@kayarre @Ron84 You can try out the latest MR by:\

1. Check out this MR
2. Run make
3. Edit your CMakeLists.txt to set: VTK_MODULE_ENABLE_VTK_Boolean:STRING=YES
4. There are two tests. Run them with:
   ctest --R PolyDataBooleanFilter