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/doc/index.rst

@@ -0,0 +1,39 @@
+deltachat python bindings
+=========================
+
+The ``deltachat`` Python package provides two bindings for the core C-library
+of the https://delta.chat messaging ecosystem:
+
+- :doc:`capi` is a lowlevel CFFI-binding to the
+  `deltachat-core C-API <https://c.delta.chat>`_.
+
+- :doc:`api` [work-in-progress] is a high level interface to deltachat-core which aims
+  to be memory safe and thoroughly tested through continous tox/pytest runs.
+
+
+getting started
+---------------
+
+.. toctree::
+   :maxdepth: 2
+
+   install
+   examples
+
+.. toctree::
+   :hidden:
+
+   links
+   changelog
+   api
+   capi
+   lapi
+
+..
+    Indices and tables
+    ==================
+
+    * :ref:`genindex`
+    * :ref:`modindex`
+    * :ref:`search`
+