Instead use the newly added abstractions from ProjectExplorer.
This makes the plugin qmake-independent in principle; any build system
can be used as long as the respective QtCreator plugin provides a way to
set up the required deployment information.
As a side effect of this patch, two features are lost:
    (1) The ability to add a remote directory automatically for a
RemoteLinux based target. This was rarely ever useful, because any non-
trivial project requires more files to be deployed than just one binary.
    (2) The ability to add Desktop files and icons for Fremantle and
Harmattan projects. Similar points as above apply here as well; such
projects should be set up via QtCreator's wizards or manually by users
who know what they are doing.

Change-Id: I2d7e621256f01143aafe3b191b04a120f053e672
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>