core: add __NOT_HPI_MODULE__ flag to mark utility files etc

(more of an intermediate solution perhaps)

my/google/takeout/html.py

@@ -139,3 +139,5 @@ def read_html(tpath: Path, file: str) -> Iterable[Parsed]:
         data = fo.read()
         parser.feed(data)
     return results
+
+from ...core import __NOT_HPI_MODULE__

my/google/takeout/paths.py

@@ -3,7 +3,8 @@ Module for locating and accessing [[https://takeout.google.com][Google Takeout]]
 '''
 
 from dataclasses import dataclass
-from ...core.common import Paths
+from ...core.common import Paths, get_files
+from ...core.util import __NOT_HPI_MODULE__
 
 from my.config import google as user_config
 @dataclass
@@ -19,7 +20,6 @@ config = make_config(google)
 from pathlib import Path
 from typing import Optional, Iterable
 
-from ...common import get_files
 from ...kython.kompress import kopen, kexists