feat: bring back and adapt python bindings with rust core

* import python, try to adapt for rust

* add missing wrapper functions

* - try to write up how to build python bindings
- strike some unused functions from deltachat.h

* adjustments to make tox work

* try to run circle-ci with python build

* don't do docs

* running cargo test as well

* don't run cargo test anymore, that's done in other ci jobs

* also build docs

* don't run doxygen anymore

* subst C with Rust

* a try to get better wheels

Closes #41

python/setup.py

@@ -0,0 +1,44 @@
+import setuptools
+import os
+import re
+
+
+def main():
+    long_description, version = read_meta()
+    setuptools.setup(
+        name='deltachat',
+        version=version,
+        description='Python bindings for deltachat-core using CFFI',
+        long_description=long_description,
+        author='holger krekel, Floris Bruynooghe, Bjoern Petersen and contributors',
+        setup_requires=['cffi>=1.0.0'],
+        install_requires=['cffi>=1.0.0', 'requests', 'attrs', 'six'],
+        packages=setuptools.find_packages('src'),
+        package_dir={'': 'src'},
+        cffi_modules=['src/deltachat/_build.py:ffibuilder'],
+        classifiers=[
+            'Development Status :: 4 - Beta',
+            'Intended Audience :: Developers',
+            'License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)',
+            'Programming Language :: Python :: 3',
+            'Topic :: Communications :: Email',
+            'Topic :: Software Development :: Libraries',
+        ],
+    )
+
+
+def read_meta():
+    with open(os.path.join("src", "deltachat", "__init__.py")) as f:
+        for line in f:
+            m = re.match('__version__ = "(\S*).*"', line)
+            if m:
+                version, = m.groups()
+                break
+
+    with open("README.rst") as f:
+        long_desc = f.read()
+    return long_desc, version
+
+
+if __name__ == "__main__":
+    main()