qt5 moc

There is an issue with qt5.12 and the way qtsolutions uses moc. This results in this error:

CMake Error at TriBITS/tribits/core/package_arch/TribitsLibraryMacros.cmake:785 (ADD_LIBRARY):
  Cannot find source file:

    moc_qtpropertybrowserutils_p.cpp

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
  .hpp .hxx .in .txx
Call Stack (most recent call first):
  qtpropertybrowser/src/CMakeLists.txt:77 (TRIBITS_ADD_LIBRARY)

It is overdue to migrate away from qtsolutions.
This is an hold over from qt4 days. I think qt5 supports most of the functionality we need.