Refactor skills framework

Follow-up MRs:

• robot-skill-templates!48 (merged)
• armarx-simulation!66 (merged)
• sw/armarx/skills/control!37 (merged)
• sw/armarx/skills/kinesthetic-learning!2 (merged)
• sw/armarx/skills/localization-and-mapping!3 (merged)
• sw/armarx/skills/manipulation!33 (merged)
• sw/armarx-integration/robots/armar7/skills!8
• ... --> see comment

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

@@ -29,7 +29,7 @@ namespace armarx
             // Utiliy methods
             aron::data::DictPtr getDefaultParameters(const std::string& profileName = "root");
 
-        private:
+        protected:
             manager::dti::SkillManagerInterfacePrx manager;
             SkillDescription skillDescription;
         };