Release v1.4.0

Added:

1. Utility function SliceToString that allows to convert string of any type and mixed items into string with selectable separator between them
2. L format option to add slices in formatting string i.e. "This is a list(slice) test: {0:L-}", with the slice []any{"s1", "s2", "s3"} produces the following line This is a list(slice) test: s1-s2-s3 . Such option available in both Format and FormatComplex methods
3. According to benchmark tests formatting slice via sf from 50 to 250 percent faster then with fmt