unattended install for winpcap, removed package icon

The authors of WinPcap removed the silent install feature. But for chocolatey packages it’s essential to have silent/unattended installing packages. Therefore I created an AutoHotkey script which handles this. I hope you like it.

In addition I removed the package icon. The icon was only 16 × 16 px and thus doesn’t meet the package icon guidelines: https://github.com/chocolatey/chocolatey/wiki/CreatePackages#package-icon-guidelines

I tested the updated package and it works fine.