Nionutils

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- Minor maintenance.

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- Add minor Color method to get RGB values.
- Add DateTime utilities (utcnow for Windows, strictly increasing).

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- Add a Color utility class.
- Fix issues with FloatToScaledIntegerConverter when min/max are invalid.
- Fix possible race condition in thread pool.

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- Improve convert_back method of IntegerToStringConverter for fuzzy conversion.

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- Ensure component prioritization works.
- Fix top level namespace.

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- Minor typing and return type issues.