Create Annotator() class (#4591)

* Add Annotator() class

* Download Arial

* 2x for loop

* Cleanup

* tuple 2 list

* max_size=1920

* bold logging results to

* tolist()

* im = annotator.im

* PIL save in detect.py

* Smart asarray in detect.py

* revert to cv2.imwrite

* Cleanup

* Return result asarray

* Add `Profile()` profiler

* CamelCase Timeout

* Resize after mosaic

* pillow>=8.0.0

* daemon imwrite

* Add cv2 support

* Remove plot_wh_methods and plot_one_box

* pil=False for hubconf.py annotations

* im.shape bug fix

* colorstr common.py

* join daemons

* Update t.daemon

* Removed daemon saving

utils/general.py

@@ -122,9 +122,10 @@ def is_pip():
     return 'site-packages' in Path(__file__).absolute().parts
 
 
-def is_ascii(str=''):
+def is_ascii(s=''):
     # Is string composed of all ASCII (no UTF) characters?
-    return len(str.encode().decode('ascii', 'ignore')) == len(str)
+    s = str(s)  # convert to str() in case of None, etc.
+    return len(s.encode().decode('ascii', 'ignore')) == len(s)
 
 
 def emojis(str=''):