Add gyp and python_setuptools packages.

Requested by Waddlesplash.
Update HaikuWebkit to 1.4.0 for x86_64

There are some known issues with this version (1.4.1 will follow soon), but at least it fixes the build.
BZlibCompressionAlgorithm: Basic support for gzip format
compression_test: Add option for gzip format
Add WIP VirtualBox Guest Additions package

For now only clipboard sharing is supported. Run VBoxTray to activate it.

My first uploaded package :)