[cleanup] Misc fixes (see desc)

[cleanup] Misc fixes (see desc)

* [tvver] Fix bug in 6837633a4a614920b6e43ffc6b4b8590dca8c9d7 - Closes #4054
* [rumble] Fix tests - Closes #3976
* [make] Remove `cat` abuse - Closes #3989
* [make] Revert #3684 - Closes #3814
* [utils] Improve `get_elements_by_class` - Closes #3993
* [utils] Inherit `Namespace` from `types.SimpleNamespace`
* [utils] Use `re.fullmatch` for matching filters
* [jsinterp] Handle quotes in `_separate`
* [make_readme] Allow overshooting last line

Authored by: pukkandan, kwconder, MrRawes, Lesmiscore