added OptoForceUnitObserver

scenarios/OptoForceUnit/OptoForceUnit.scx

scenarios/OptoForceUnit/config/OptoForceUnitApp.cfg

scenarios/OptoForceUnit/config/OptoForceUnitObserverApp.cfg

source/RobotAPI/applications/CMakeLists.txt

...obotAPI/applications/OptoForceUnitObserver/CMakeLists.txt

source/RobotAPI/applications/OptoForceUnitObserver/main.cpp

source/RobotAPI/components/units/CMakeLists.txt

source/RobotAPI/components/units/OptoForceUnitObserver.cpp

source/RobotAPI/components/units/OptoForceUnitObserver.h

source/RobotAPI/drivers/OptoForceUnit/CMakeLists.txt

source/RobotAPI/drivers/OptoForceUnit/OptoForceUnit.cpp

source/RobotAPI/drivers/OptoForceUnit/OptoForceUnit.h

source/RobotAPI/interface/CMakeLists.txt

source/RobotAPI/interface/units/OptoForceUnit.ice