Qt Version refactoring
Split up target specific code into subclasses. Also change Qt4BuildConfiguration to allow a null qtversion. Remove code that relied on always having a qt version. Also make it possible to remove all qt versions. Completly change the qt in path autodetection to be only a fall back if no configuration was found. Note: For now the old settings are not removed, as such 2.2 and master can coexist. Reviewed-By: hunger
This diff is collapsed.