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/gui-plugins/SkillManagerPlugin/aronTreeWidget/widgets/EditMatrixWidget.cpp

@@ -9,7 +9,6 @@
 #include "../../ColorPalettes.h"
 #include "../visitors/AronTreeWidgetCreator.h"
 #include "NDArrayHelper.h"
-#include "visitors/AronTreeWidgetCreator.h"
 
 namespace armarx
 {