Acacia experiments with python handlers

[spectranaut]

This experiment currently only runs on linux -- works for both chrome and firefox, but not "chromium". The browser is derived from the UA string, and the UA string doesn't differentiate between chrome and chromium.

To run the test:

1. Install the acacia library
2. (for debian) install python3-ua-parser (or pip install ua-parser)
3. run a wpt server with ./wpt serve (see WPT docs)
4. navigate to http://web-platform.test:8000/core-aam/acacia/test.html

or run:

./wpt run --force-renderer-accessibility chrome /core-aam/acacia/test.html
./wpt run --force-renderer-accessibility firefox /core-aam/acacia/test.html

[spectranaut]

Closing as this was just an exploration, and ultimately not the right direction.