Merge branch 'feature/cleanup-and-opencv4-include' into 'master'

source/RobotAPI/libraries/ArmarXObjects/ObjectFinder.cpp

.../ltm/processors/converter/data/image/png/PngConverter.cpp

...armem_objects/server/familiar_object_instance/Segment.cpp

source/RobotAPI/libraries/skills/core/Skill.cpp

source/RobotAPI/libraries/skills/core/Skill.h

source/RobotAPI/libraries/skills/core/SkillDescription.h

source/RobotAPI/libraries/skills/core/SkillID.h

source/RobotAPI/libraries/skills/core/SkillProxy.cpp

source/RobotAPI/libraries/skills/core/SkillStatusUpdate.cpp

source/RobotAPI/libraries/skills/core/SkillStatusUpdate.h

source/RobotAPI/libraries/skills/core/error/Exception.h

source/RobotAPI/libraries/skills/provider/PeriodicSkill.cpp

...tAPI/libraries/skills/provider/PeriodicSpecializedSkill.h

...obotAPI/libraries/skills/provider/SimplePeriodicSkill.cpp

...ibraries/skills/provider/SimplePeriodicSpecializedSkill.h

source/RobotAPI/libraries/skills/provider/SpecializedSkill.h

...ies/skills/provider/detail/SkillImplementationWrapper.cpp