ClangFormat: apply to source, most of intern

Apply clang format as proposed in T53211.

For details on usage and instructions for migrating branches
without conflicts, see:

https://wiki.blender.org/wiki/Tools/ClangFormat

source/blender/python/bmesh/bmesh_py_ops_call.h

@@ -25,11 +25,10 @@
 #define __BMESH_PY_OPS_CALL_H__
 
 typedef struct {
-	PyObject_HEAD /* required python macro   */
-	const char *opname;
+  PyObject_HEAD /* required python macro   */
+      const char *opname;
 } BPy_BMeshOpFunc;
 
-
 PyObject *BPy_BMO_call(BPy_BMeshOpFunc *self, PyObject *args, PyObject *kw);
 
 #endif /* __BMESH_PY_OPS_CALL_H__ */