Compile with -DQT_NO_KEYWORDS by default
Enable end-user Qt applications that rely on qicstable to compile with -DQT_NO_KEYWORDS without needing to modify qicstable sources. This follows what is currently possible with Qt as well as VTK and Qwt; two other prominent Qt-based libraries.
This helps end-user Qt applications linking to a large list of libraries deconflict symbols between them.