Pynetgear

Add a way to force cookie-based (v2) authentication method

- Actual useful CLI with json output (59)
- Dockerfile for this CLI (60)

Thanks liaden !

- reset headers to use new cookie after reauthorization
- Try login v1 before v2

Stack overflow when login fails
https://github.com/home-assistant/home-assistant/issues/17800

Features:
- Implements device blocking
- Implements login v2 using a cookie
- Improves logging

Bugfixes:
- Add content-type to headers to fix some models
- Allows 0000 response code for Nighthawk M1

Changelog:
- Filter out non valid XML characters, fix 46