Merge pull request #156 from janvolck/main

relax displayio._background thread

diff --cc displayio/__init__.py
index 9e9d97741db91c70320b3e397067f503347aaee3,b22ce94c9113c19861d21f5afcbe4ff4d63c577c..e42d24a60d48c00019de9cd474d0a8f458497f96
--- 1/displayio/__init__.py
--- 2/displayio/__init__.py
+++ b/displayio/__init__.py
@@@ -17,8 -17,14 +17,9 @@@ displayio for Blink
  
  """
  import threading
+ import time
  from typing import Union
  
 -import fourwire
 -import i2cdisplaybus
 -from busdisplay import BusDisplay
 -from busdisplay._displaybus import _DisplayBus
 -from epaperdisplay import EPaperDisplay
  from ._bitmap import Bitmap
  from ._colorspace import Colorspace
  from ._colorconverter import ColorConverter