currently "option forwardfor" cant't be unset, so there is no way to enable it in the default section and disable it in a particular frontend

Instead of documenting build information in README.md and BUILD-WINDOWS.md, we should create a new .rst document so that it can be hosted along with the other docs on https://lsquic.readthedocs.io

The build chapter should cover:

• Building on Linux
• Building on Windows
• Building using Docker
• Building library only (without example programs, in order not to depend on libevent)
• Building

Feature request

Is your feature request related to a problem? Please describe

The analysis.py script provides just one confidence interval: 95%. While that is related to the 2-sigma interval of normal distribution, so in theory allows for easy estimation of bigger confidence intervals (like 3, 4, 5-sigma), it assumes a normal distribution, which the differences don't follow, and may be

Python 3.9 was released some time ago, we should update the CI config to run tests on it too