Initial commit, working GPIO for all available CHIP GPIO pins, have not tested edge detection and callbacks

source/constants.h

@@ -0,0 +1,14 @@
+PyObject *high;
+PyObject *low;
+PyObject *input;
+PyObject *output;
+PyObject *alt0;
+PyObject *pud_off;
+PyObject *pud_up;
+PyObject *pud_down;
+PyObject *rising_edge;
+PyObject *falling_edge;
+PyObject *both_edge;
+PyObject *version;
+
+void define_constants(PyObject *module);