1.2: Rating scales

Implements:

• Rating scales (see !77 (merged));
• Unity 2021.3.16f1.

Fixes:

• The RAM consumption of runtime generated wall materials was piling up through trials;
• Inter-trial break timer getting below 0 right before the end;
• Starting an experiment after leaving during an inter-block break makes you start by an inter-block trial;
• User ID and session input fields were not cleared between experiments;
• "tiling" and "heightMapScale" properties were not taken in account for wall materials;
• A clipping between the UI and a wall of the room could be seen in editor view during a trial;
• Removes unnecessary test for the seed of the experiment;
• Set the lightbulbs/sources 30cm lower to avoid to much shadows on the ceiling when normal maps are involved.