From CMake Docs( https://cmake.org/cmake/help/latest/variable/BUILD_SHARED_LIBS.html ),
BUILD_SHARED_LIBS may not be defined. This can result in printinfo.cmake outputing
variable without a value. A conditional is applied to ensure that some output is
provided to the user should variable not be defined.
Removed explicit C++ standard flag. Any setting user would add on the command
line would be replaced due to ordering. `-std=c++0x` would be last value added
to CMAKE_CXX_FLAGS and ultimately the one used by the compiler.
Update CMake search for Qt5 componets to be consistent
with recommended practice from Kitware.
(see https://blog.kitware.com/cmake-finding-qt5-the-right-way/)
Incorporate ability to build cppcheck-gui with Qt Charts
via CMake switch. Option "WITH_QCHARTS" will enable
search for Qt Charts to Qt5 component search and add
build flag "HAVE_QCHART".
Scott Furry
Frank Zingsheim
orbitcowboy
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