Added 3 miscellaneous snippets to the Code Snippets Database

A rag bag of three new snippets have been added to the Code Snippets Database. They are: (1) JPEGPixelFormatToPixelFormat that converts a JPEG pixel format into the equivalent TJPEGPixelFormat, (2) SimplifyFraction that reduces a fraction to its lowest terms and (3) VariantIsObject that tests if a Variant or OleVariant contains an object.
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