Vendor attrs and typing

[tmr232]

Github is dropping support for Python 2.7 - actions/setup-python#672

This means that using Python2 to fetch and install attrs and typing for Jython (

ghidra-pyi-generator/.github/workflows/publish.yml

Lines 80 to 92 in ad01e1e

	- name: Setup python
	uses: actions/setup-python@v2
	with:
	python-version: "2.7"
	- uses: er28-0652/setup-ghidra@master
	with:
	version: "${{ needs.set-versions.outputs.ghidra-ver }}"
	- name: Prepare Jython Environment
	run: |
	pip2.7 install --target="$GHIDRA_INSTALL_DIR/Ghidra/Features/Python/data/jython-2.7.2/Lib/site-packages" attrs typing
	pip2.7 install --target="$GHIDRA_INSTALL_DIR/Ghidra/Features/Python/data/jython-2.7.3/Lib/site-packages" attrs typing

) will stop working soon.

I think the best solution is to vendor those packages, and copy things over ourselves (as we won't have pip).

[tmr232]

I ran a terrible hack (#20 ) to get the Jython site packages from the CI.
We now need to:

1. Put in it the repo (and list licenses!)
2. Change the CI task to copy that over instead of installing Python2.7 and running pip.

jython-site-packages.zip