Resolve "run large tests only when merging to the main"

• Test new functionality
• Check if the documentation is complete for all functions
• Remove unnecessary print commands
• Remove unnecessary comment blocks
• ClassNames in UpperCamelCase, functionNames in lowerCamelCase, var_names with under_score
• Merge main into current branch
• Update version und history files
• Add spent time with /spend command to merge request

Closes issues #73 (closed) #76 (closed) #69 (closed)