ProjectExplorer: Introduce generic application runner.

This class aims to be a flexible worker class for SSH-based
run controls. It supersedes AbstractRemoteLinuxApplicationRunner
as well as all of its derived classes, while having no
RemoteLinux dependencies itself.

Change-Id: If24f03a32126b36fc3d0b253a1615ad0af5f2b46
Reviewed-by: hjk <qthjk@ovi.com>