remove pybind11 to readd as subtree

examples/knxPython/pybind11/docs/limitations.rst

@@ -1,20 +0,0 @@
-Limitations
-###########
-
-pybind11 strives to be a general solution to binding generation, but it also has
-certain limitations:
-
-- pybind11 casts away ``const``-ness in function arguments and return values.
-  This is in line with the Python language, which has no concept of ``const``
-  values. This means that some additional care is needed to avoid bugs that
-  would be caught by the type checker in a traditional C++ program.
-
-- The NumPy interface ``pybind11::array`` greatly simplifies accessing
-  numerical data from C++ (and vice versa), but it's not a full-blown array
-  class like ``Eigen::Array`` or ``boost.multi_array``.
-
-These features could be implemented but would lead to a significant increase in
-complexity. I've decided to draw the line here to keep this project simple and
-compact. Users who absolutely require these features are encouraged to fork
-pybind11.
-