Add declarations to saferesources.cpp objects in qsaferesource.h

Running Polyspace static MISRA C++ 2008 checker against Safe RCC Tool generated saferesources.cpp file gave MISRA C++:2008 3-3-1 rule violation. That is, there are objects with external linkage that should have declarations in header files. This issue could possibly be easily fixed by adding the declarations to qsaferesource.h.