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/BPY_extern_clog.h

@@ -23,9 +23,8 @@
 #ifndef __BPY_EXTERN_CLOG_H__
 #define __BPY_EXTERN_CLOG_H__
 
-
 /* bpy_interface.c */
 extern struct CLG_LogRef *BPY_LOG_RNA;
 extern struct CLG_LogRef *BPY_LOG_CONTEXT;
 
-#endif  /* __BPY_EXTERN_CLOG_H__ */
+#endif /* __BPY_EXTERN_CLOG_H__ */