Potential enhancement: alternative to Packet.dll

The majority of Npcap users use it via the libpcap API in wpcap.dll. That, in turn, uses Packet.dll to communicate with the Npcap driver. There are lots of things less than ideal about the Packet API (Packet32.h): uninformative return codes, hacky support of Unicode in only a few functions, incomplete use of SetLastError(), limited capture statistics and zero extensibility, etc. I propose replacing Packet.dll with a new API that would be consistent and extensible. We would continue to maintain and install Packet.dll for compatibility for a while until it became reasonably certain that it was no longer needed. A new module for libpcap which uses the new API would be part of this effort, also.

Start by reviewing the existing Packet.dll API in Packet32.h and how wpcap.dll uses it through the libpcap API. Define the scope and design of a consistent, extensible replacement, including compatibility with Packet.dll and a new libpcap module; the issue does not identify specific files or tests.