SkillManagerGUI: Constructing new skill instances each time the "Update and Search" button is pressed

Summary: Constructors of skills are called very often, which might be problematic.

Current behavior and steps to reproduce: Write an ARMARX_INFO, for example, in the constructor of the "Say" skill at armarx/skills/speech source/armarx/speech/skills/skills/Say.cpp. Start, for example in simulation, all necessary dependencies and open a SkillManagerGUI. Each time the Update and Search button is clicked, the message will again appear in the log. Due to de-duplication, make sure to have a look at the original log in the terminal rather than the one in the log viewer.

Expected behavior: A skill is only constructed when it is invoked, plus potentially once in the beginning to have an instance already available.

assigned to @plewnia

(it is particularly noticeable when having "Auto Update" activated, which seems to not only update the executions table on the top, but also the lower part of the GUI)

changed the description

assigned to @rietsch and unassigned @plewnia

re-assigned to @rietsch , as @rietsch and @meixner took over the skills framework from Fabian T. This might be a GUI problem though and I#m not sure who is responsible for that?