This PR introduces a new get_param function. For its default values it checks a dictionary largely filled by reading the preferences UI files. The goal is to have all defaults in one place to avoid inconsistencies. The dictionary is created once and then stored in a global variable.
Once merged this function will be implemented in Draft and Arch. The get_param function in utils.py will become obsolete.
Related issue: #10176
This PR replaces the showSnapBar and hideSnapBar preferences with a single new preference: SnapBarShowOnlyDuringCommands.
Additonally:
Improved some param observer callbacks.
