Consult QtC build directory user preferences

In a default QML project, when DS generates CMake files, it generates a file, CMakeLists.txt.shared, in the root directory of the project. Contained in this file is a directive for setting the build directory when the project is opened in QtC. This setting overrides user preferences for build directory names and locations. In most cases, the generic build directory generated by DS does not conform to the preference set by the user in QtC. It would be best if DS were to consult the QtC setting and construct a compliant build directory.