Qbs project file tweaks

* Add zlib as dynamic library rather than linker flag
* Glob the QML files and images in a way that makes them listed in Qt
  Creator and install them to a location where the stuff is found (not
  ideal for Linux distros, though).
Re-added walking with mouse

This is a temporary solution to be able to walk around on my phone.
I don't consider handling the mouse this way ideal.