Added Openrotorfan strategy

propulsion_design/CMakeLists.txt

propulsion_design/propulsion_design_conf.xml

propulsion_design/src/engine_design/engine_design.cpp

propulsion_design/src/engine_design/engine_design.h

propulsion_design/src/engine_design/rubber/openrotorfan.cpp

propulsion_design/src/engine_design/rubber/rubber_design.h

...sion_design/src/integration/default/default_integration.h

propulsion_design/src/integration/default/openrotorfan.cpp

propulsion_design/src/io/aircraft_xml.cpp

propulsion_design/src/io/aircraft_xml.h

propulsion_design/src/mass/default/default_mass.h

propulsion_design/src/mass/default/openrotorfan.cpp

propulsion_design/src/nacelle/default/default_nacelle.h

propulsion_design/src/nacelle/default/openrotorfan.cpp

propulsion_design/src/nacelle/default/turbofan.cpp

propulsion_design/src/propulsion.h

propulsion_design/src/propulsion_strategy.h

propulsion_design/src/pylon/default/default_pylon.h

propulsion_design/src/pylon/default/openrotorfan.cpp

propulsion_design/src/utility.cpp