Kmax

What's Changed
* Fix bug in .config file generation that uses invalid nonbool value by paulgazz in https://github.com/paulgazz/kmax/pull/240


**Full Changelog**: https://github.com/paulgazz/kmax/compare/v4.5...v4.5.1

- Populate non-bools when generating configs, either by taking them
from the input config for krepair or a default from kconfig
- Generalize support for rewriting kbuild paths, adding
builtins (--no-builtin-kbuild-path-rewrites) and
user-defined rewrites (--user-kbuild-path-rewrites). These are needed
because the path to a compilation unit from a Kbuild Makefile may not
match the file system path due to relative paths
- Added krepair experiment scripts
- Various documentation updates and additions
- Various bugfixes and improvements

Adds timeout durations to koverage. Adds krepair experiment scripts. Fixes a bug in code that deletes a kismet temporary file by checking whether the file exists first.

This version updates kismet to properly support older Linux versions (around 4.16 and older) by (1) backporting updates to kextract needed for kismet and (2) patching Kconfig on the fly to use the newer Kconfig error reporting for validation, since older Kconfig versions have less precise unmet dependency messages.

This version also improves error reporting by segragating errors into stderr and info into stdout, adding error messages for unfound architectures and missing Kconfig files.

Fixes a bug in checking the extensions of source/object filenames
passed to klocalizer.

This version moves the whole tool suite to python 3, instead of using
setuptool's 2to3, and removes support for python 2, which was sunset in
2020.