Add Missing Docstrings and Metadata to Functions in utils.py

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Several functions in utils.py lack docstrings and metadata. While parse_color is documented, other functions like check_format, load_object_template, and load_object_tileset are missing explanations for their purpose, input parameters, and return values. Adding consistent docstrings for these functions would improve code readability and maintainability, making it easier for others to understand and use them.