Add implementations for wchar keys and update headers. All of the
getteers except for string behave as the non wchar impelemntations. The
string getter must be different since the string being returned is a
newely allocated wchar which the caller is responsible to free.
Add implementations for wchar keys and update headers. All of the getteers except for string behave as the non wchar impelemntations. The string getter must be different since the string being returned is a newely allocated wchar which the caller is responsible to free.
Resolves issue #182