Client enhancements to get crtime, file magic, and PE headers data

I used MSYS2 with MINGW to build libgnurx-0.dll and magic1.dll for Windows to be able to properly use python-magic.  The installer would also need to be modified to include the file magic database magic.mgc in the client installed directory.

I removed some packing detection and checksum comparison due to it having a pretty significant performance hit on larger binaries.  It may be worth it to enable those via options when a flow is run.

This also carves off the PKCS7 certs on PE files and returns them.  There might be better ways to do this.
This code looks great, but it *really* needs some tests.  We have one exe in test_data, start by parsing that :) It would be good to have a large optional set of EXEs to run it against that we distribute outside of the code repo like how we do for the memory image.  Maybe pull exes from one of the forensics test images floating around?