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Upgrade to release 4.0:

- Cookiecutter, Django and Travis extensions extracted to their
  own repositories
- Support for Python 3.4 and 3.5 dropped
- Dropped deprecated requirements.txt file
- Added support for global configuration (avoid retyping common
  putup's options)
- PyScaffold is no longer a build-time dependency, it just
  generates the project structure
- Removed contrib subpackage, vendorized packages are now runtime
  dependencies
- setuptools_scm is included by default in setup.cfg, setup.py and
  pyproject.toml
- API changed to use pyscaffold.operations instead of integer
  flags
- Allow string.Template and callable as file contents in project
  structure
- Extract file system functions from utils.py into file_system.py
- Extract identification/naming functions from utils.py into
  identification.py
- Extract action related functions from api/__init__.py to
  actions.py
- helpers.{modify,ensure,reject} moved to structure.py
- helpers.{register,unregister} moved to actions.py
- New extension for automatically creating virtual environments
  (--venv)
- Added instructions to use pip-tools to docs
- pre-commit extension now attempts to install hooks automatically
- A nice message is now displayed when PyScaffold finishes running
  (actions.report_done)
- Removed mutually exclusive argparse groups for extensions
- Progressive type annotations adopted in the code base together
  with mypy linting
- Simplified isort config
- pyproject.toml and isolated builds adopted by default
- Added comment to setup.cfg template instructing about extra links
- Generate tox.ini by default
- Replace pkg_resources with importlib.{metadata,resources} and
  packaging
- Adopt PEP 420 for namespaces
- Adopt SPDX identifiers for the license field in setup.cfg
- Removed deprecated log.configure_logger
- Add links to issues and pull requests to changelog
- Add an experimental --interactive mode (inspired by git rebase -i)
- Reorganise the FAQ (including version questions previously in
  Features)
- Updated setuptools and setuptools_scm dependencies to minimal
  versions 46.1 and 5, respectively
- Adopted no-guess-dev version scheme from setuptools_scm
  (semantically all stays the same, but non-tag commits are now
  versioned LAST_TAG.post1.devN instead of LAST_TAG.post0.devN)
- Fix problem of not showing detailed log with --verbose if error
  happens when loading extensions

Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>