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/intern/bpy_operator.h

@@ -23,10 +23,10 @@
 
 extern PyTypeObject pyop_base_Type;
 
-#define BPy_OperatorBase_Check(v)	(PyObject_TypeCheck(v, &pyop_base_Type))
+#define BPy_OperatorBase_Check(v) (PyObject_TypeCheck(v, &pyop_base_Type))
 
 typedef struct {
-	PyObject_HEAD /* required python macro   */
+  PyObject_HEAD /* required python macro   */
 } BPy_OperatorBase;
 
 PyObject *BPY_operator_module(void);