Function urlDecode( txt )

Description:
Reverses the quoting performed by urlEncode. Percent-encoded sequences (%xx) are replaced by the ASCII character with the hexadecimal code xx.
Parameters:
txt (String)
input (encoded) string
Return Value (String):
output (unencoded) string
Example:
urlDecode("RR%20Lyr") = "RR Lyr"
See Also:
RFC 3986
Signature:
String urlDecode(String)