Install ( output ) directory should not have a hard coded path

The projects files are built with hard coded paths of the install directory instead of respecting QTDIR. This is an issue even with Dev Studio.

The Output Directory is also set to "." in each of the Qt projects. This means that the LIB files get built in the same folder as the VCPROJ file which is incorrect. Fortunately, Dev Studio ignores this directive and places the LIB files alongside the DLL file which is properly specified to live in the lib folder. But IncrediBuild respects this setting and fails to build the subsequent projects correctly.