Change commandline runner implementation

Change commandline runner implementation

- Get rid of TrajectoryAnalysisCommandLineRunner class mapping and map
  'runAsMain' static function instead
- Change 'ModuleFactory' typedef to std::function to allow passing
  functors as module factories
- Implement python interface to 'runAsMain' that creates the factory to
  give appropriate C++ module object to the GROMACS command line runner
  subsystem