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/examples.rst

@@ -0,0 +1,38 @@
+
+
+examples
+========
+
+
+Playing around on the commandline
+----------------------------------
+
+Once you have :doc:`installed deltachat bindings <install>`
+you can start playing from the python interpreter commandline::
+
+For example you can type ``python`` and then::
+
+    # instantiate and configure deltachat account
+    import deltachat
+    ac = deltachat.Account("/tmp/db")
+
+    # start configuration activity and smtp/imap threads
+    ac.start_threads()
+    ac.configure(addr="test2@hq5.merlinux.eu", mail_pw="********")
+
+    # create a contact and send a message
+    contact = ac.create_contact("someother@email.address")
+    chat = ac.create_chat_by_contact(contact)
+    chat.send_text_message("hi from the python interpreter command line")
+
+Checkout our :doc:`api` for the various high-level things you can do
+to send/receive messages, create contacts and chats.
+
+
+Looking at a real example
+-------------------------
+
+The `deltabot repository <https://github.com/deltachat/deltabot#deltachat-example-bot>`_
+contains a real-life example of Python bindings usage.
+
+