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_driver.h

@@ -24,4 +24,4 @@
 int bpy_pydriver_create_dict(void);
 extern PyObject *bpy_pydriver_Dict;
 
-#endif  /* __BPY_DRIVER_H__ */
+#endif /* __BPY_DRIVER_H__ */