ViZDoom 1.2.2: Fix for Python source distribution missing pybind11, fix manual building

ViZDoom 1.2.2 Release Notes

The aim of this release is mainly to fix some issues with installing ViZDoom on configurations that cannot use binary wheels.

What's Changed

• Create FUNDING.yml by @mwydmuch in #557
• Create CODE_OF_CONDUCT.md by @mwydmuch in #559
• Building and CI/CD fixes by @mwydmuch in #558, #560, #562
• Documentation updates by @mwydmuch in #561, #563, and #564
• load_config/loadConfig fix by @mwydmuch in #565

Full Changelog: 1.2.1...1.2.2