Added DLL from Practical Malware Analysis book

The DLL is added in order to perform some tests using it.
It might be needed to check the license of the DLL. I haven't found any information.
Added Regression Test for Windows DLL

This regression test exposes a bug when getting the names of some imported functions from WS2_32.dll.
It uses the "Practical Malware Analysis" DLL from chapter 5.
Added autmatically generated files to .gitignore

Added some files to .gitignore that are generated when running io and seek regression tests
Move test into t.formats/pe/import_names