use sdktool to register debugger source path mapping for each Qt version

The build path of Qt may be different for different platform builds, and QtCreator's Source Paths Mappings is not always up to date. E.g., in linux, QtCreator suggests '/var/tmp/qt-src' for the Qt sources, but that's not currently used in releasing.

Instead of hardcoding paths to QtCreator sources, it should be possible to use sdktool to set the source path mapping as one of the items when registering Qt binaries.