Merge of all branches of Fabian PK (related to skills)

• Merge improved SkillManagerGUI from Tobias Bodmer
• Fix aron code generation for classes without members

@reister. YOu only need to review the changes to aron (Generator.cpp)

Depends on MR armarx-core!246 (merged)

Includes MR !285 (closed) and !320 (closed)

source/RobotAPI/libraries/armem/server/ltm/base/detail/EntityBase.h

@@ -59,11 +59,11 @@ namespace armarx::armem::server::ltm
         }
 
         /// iterate over all entity snapshots of this ltm
-        virtual bool forEachSnapshot(std::function<void(EntitySnapshotT&)>&& func) const = 0;
-        virtual bool forEachSnapshotInIndexRange(long first, long last, std::function<void(EntitySnapshotT&)>&& func) const = 0;
-        virtual bool forEachSnapshotInTimeRange(const Time& min, const Time& max, std::function<void(EntitySnapshotT&)>&& func) const = 0;
-        virtual bool forEachSnapshotBeforeOrAt(const Time& time, std::function<void(EntitySnapshotT&)>&& func) const = 0;
-        virtual bool forEachSnapshotBefore(const Time& time, std::function<void(EntitySnapshotT&)>&& func) const = 0;
+        virtual bool forEachSnapshot(std::function<void(EntitySnapshotT&)> func) const = 0;
+        virtual bool forEachSnapshotInIndexRange(long first, long last, std::function<void(EntitySnapshotT&)> func) const = 0;
+        virtual bool forEachSnapshotInTimeRange(const Time& min, const Time& max, std::function<void(EntitySnapshotT&)> func) const = 0;
+        virtual bool forEachSnapshotBeforeOrAt(const Time& time, std::function<void(EntitySnapshotT&)> func) const = 0;
+        virtual bool forEachSnapshotBefore(const Time& time, std::function<void(EntitySnapshotT&)> func) const = 0;
 
         /// find entity snapshot segment
         virtual std::shared_ptr<EntitySnapshotT> findSnapshot(const Time&) const = 0;