* use a new toolkit for user prompting: questionary (patched).
* multiline questions.
* conditional questions.
* new toolkit for ui tests: pexpect.
* fix lots of tests.
* fix windows builds with newer poetry-dynamic-versioning.
* linters and mypy are now tests, to have faster ci.
* update deprecated ci commands.
* removed dependencies from old times.
* Remove toml 0.5+ syntax (dotted keys)
* Use powershell where syntax is compatible
* Change skip to xfail
* xfail pexpect tests on windows. I'm tired of trying to make it work
* more docs
* possibly something more.
#221 introduced a regression that made the user prompt always display the default value from `copier.yml` file instead of the last answer from `.copier-answers.yml` when the latter one was available.
Here I fix that and test it too. Added a new dev dependency (pytest-timeout) to use it in tests that expect responses from STDIN and for some reason fail to obtain them do not hang in and endless loop.
I also removed the `conftest.py` file, which was only declaring a fixture that is no longer used and can actually be fixed easily using https://stackoverflow.com/a/51893526/1468388.
@Tecnativa TT23705
Fix#89 and fix#89 by adding a new extended syntax to make prompts way more usable.
Leverages plumbum's helpers, so prompt code is removed from Copier codebase, making it smaller BTW.
See README and the new test to understand the new features.
@Tecnativa TT20357
