Removed some unused imports

I found these with:

    flake8 datasette | grep unus

datasette/app.py

@@ -58,7 +58,6 @@ from .utils import (
     parse_metadata,
     resolve_env_secrets,
     to_css_class,
-    HASH_LENGTH,
 )
 from .utils.asgi import (
     AsgiLifespan,

datasette/default_magic_parameters.py

@@ -1,5 +1,4 @@
 from datasette import hookimpl
-from datasette.utils import escape_fts
 import datetime
 import os
 import time

datasette/facets.py

@@ -1,6 +1,5 @@
 import json
 import urllib
-import re
 from datasette import hookimpl
 from datasette.database import QueryInterrupted
 from datasette.utils import (
@@ -8,7 +7,6 @@ from datasette.utils import (
     path_with_added_args,
     path_with_removed_args,
     detect_json1,
-    InvalidSql,
     sqlite3,
 )
 

datasette/utils/__init__.py

@@ -5,7 +5,6 @@ from collections import OrderedDict, namedtuple, Counter
 import base64
 import hashlib
 import inspect
-import itertools
 import json
 import markupsafe
 import mergedeep
@@ -17,10 +16,9 @@ import time
 import types
 import shutil
 import urllib
-import numbers
 import yaml
 from .shutil_backport import copytree
-from .sqlite import sqlite3, sqlite_version, supports_table_xinfo
+from .sqlite import sqlite3, supports_table_xinfo
 
 
 # From https://www.sqlite.org/lang_keywords.html

datasette/utils/asgi.py

@@ -3,9 +3,7 @@ from datasette.utils import MultiParams
 from mimetypes import guess_type
 from urllib.parse import parse_qs, urlunparse, parse_qsl
 from pathlib import Path
-from html import escape
 from http.cookies import SimpleCookie, Morsel
-import re
 import aiofiles
 import aiofiles.os
 

datasette/views/base.py

@@ -9,7 +9,6 @@ import urllib
 import pint
 
 from datasette import __version__
-from datasette.plugins import pm
 from datasette.database import QueryInterrupted
 from datasette.utils import (
     await_me_maybe,

datasette/views/index.py

@@ -2,7 +2,7 @@ import hashlib
 import json
 
 from datasette.utils import check_visibility, CustomJSONEncoder
-from datasette.utils.asgi import Response, Forbidden
+from datasette.utils.asgi import Response
 from datasette.version import __version__
 
 from .base import BaseView