Create a fixed width string by truncating or padding to the desired length.
The string to pad or truncate
The desired width
Right justify with padding rather than left justify (default)
The character to use for padding, by default a space
xf.Str.FixedWidthStr("Joe", 10, , "x") => Joexxxxxxx
xf.Str.FixedWidthStr("Too long text string", 8) => Too long