Expanded and documented .gitignore

The current .gitignore is very specific to the project in the current
form and developing process and not commented.

This patch uses a more generic and commented .gitignore for python base
projects that should fit all future needs.

Signed-off-by: Claudius Heine <ch@denx.de>

.gitignore

@@ -1,7 +1,58 @@
-*.pyc
-build
-ebs-yocto
-ebs-yocto_dependencies
-kas-*
-kas.egg-info
-.vscode
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Sphinx documentation
+docs/_build/
+
+# pyenv
+.python-version
+
+# dotenv
+.env
+
+# virtualenv
+.venv
+venv/
+ENV/
+