PLDoc 1.5.21 Adds Latin Extended Character Support

PLDoc Bug #111

Support for some German extended characters and some special characters was added in the late 2000s. These characters seemed to be encoded in the WIN-1252 character set and when development moved to Linux/Mac, the German character encoding seemed to be corrupted.

The extended characters have now been respecified using Unicode code points and tested against an Oracle AL32UTF8 database