Implement toString() on Dword, SCardContext, SCardHandle.
Implement toString() on Dword, SCardContext, SCardHandle.

Dword.toString() just returns the number as %d. SCardContext.toString() returns SCardContext{%x}, and likewise for SCardHandle. Note that although handles are pointer-sized on Windows, they cannot be dereferenced.

jnasmartcardio/jnasmartcardio,0x7678/jnasmartcardio