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/tests/auditwheels.py

@@ -0,0 +1,13 @@
+
+import os
+import sys
+import subprocess
+
+
+if __name__ == "__main__":
+    assert len(sys.argv) == 2
+    workspacedir = sys.argv[1]
+    for relpath in os.listdir(workspacedir):
+        if relpath.startswith("deltachat"):
+            p = os.path.join(workspacedir, relpath)
+            subprocess.check_call(["auditwheel", "repair", p, "-w", workspacedir])