Clear up Slicelet constructor #83
Description
In GitLab by @AnastasisGeorgoulas on Oct 3, 2019, 17:08
The constructor of the Slicelet has become very long! We could split it into one or more functions that create the GUI elements, so it's easier to navigate. At the same time we can see whether we really need to save every GUI element as an attribute like we do now, or simplify some of those.