Change archiverPath and nmPath from path type to string type.
Change archiverPath and nmPath from path type to string type.

These should not be resolved against the caller's directory. This also
makes the documentation accurate now.

Change-Id: I418735fb67bb7b841e408e0ae855917caf9e1939
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@theqtcompany.com>

qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs