Resolve ambiguity with apprise.plugins module namespace

While the namespace is physically made of modules, it has been amended
to be the namespace home for the corresponding notifier classes as well.

This turned out to confuse both humans and machines on various ends.

While it has apparently worked for a while, it croaks on Python 3.11
now, and is not considered to have been a good idea in general.

test/test_plugin_flock.py

@@ -26,7 +26,8 @@ from unittest import mock
 
 import pytest
 import requests
-from apprise import plugins
+
+from apprise.plugins.NotifyFlock import NotifyFlock
 from helpers import AppriseURLTester
 
 # Disable logging for a cleaner testing output
@@ -44,74 +45,74 @@ apprise_url_tests = (
     }),
     # Provide a token
     ('flock://%s' % ('t' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Image handling
     ('flock://%s?image=True' % ('t' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
 
         # Our expected url(privacy=True) startswith() response:
         'privacy_url': 'flock://t...t',
     }),
     ('flock://%s?image=False' % ('t' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     ('flock://%s?image=True' % ('t' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
         # Run test when image is set to True, but one couldn't actually be
         # loaded from the Asset Object.
         'include_image': False,
     }),
     # Test to=
     ('flock://%s?to=u:%s&format=markdown' % ('i' * 24, 'u' * 12), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Provide markdown format
     ('flock://%s?format=markdown' % ('i' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Provide text format
     ('flock://%s?format=text' % ('i' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Native URL Support, take the slack URL and still build from it
     ('https://api.flock.com/hooks/sendMessage/{}/'.format('i' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Native URL Support with arguments
     ('https://api.flock.com/hooks/sendMessage/{}/?format=markdown'.format(
         'i' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Bot API presumed if one or more targets are specified
     # Provide markdown format
     ('flock://%s/u:%s?format=markdown' % ('i' * 24, 'u' * 12), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Bot API presumed if one or more targets are specified
     # Provide text format
     ('flock://%s/u:%s?format=html' % ('i' * 24, 'u' * 12), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Bot API presumed if one or more targets are specified
     # u: is optional
     ('flock://%s/%s?format=text' % ('i' * 24, 'u' * 12), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Bot API presumed if one or more targets are specified
     # Multi-entries
     ('flock://%s/g:%s/u:%s?format=text' % ('i' * 24, 'g' * 12, 'u' * 12), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Bot API presumed if one or more targets are specified
     # Multi-entries using @ for user and # for channel
     ('flock://%s/#%s/@%s?format=text' % ('i' * 24, 'g' * 12, 'u' * 12), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Bot API presumed if one or more targets are specified
     # has bad entry
     ('flock://%s/g:%s/u:%s?format=text' % ('i' * 24, 'g' * 12, 'u' * 10), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Invalid user/group defined
     ('flock://%s/g:/u:?format=text' % ('i' * 24), {
@@ -121,29 +122,29 @@ apprise_url_tests = (
     # As a result, the following will load and pass the data upstream
     ('flock://%s/g:%s/u:%s?format=text' % ('i' * 24, 'g' * 14, 'u' * 10), {
         # We will still instantiate the object
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
     }),
     # Error Testing
     ('flock://%s/g:%s/u:%s?format=text' % ('i' * 24, 'g' * 12, 'u' * 10), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
         # force a failure
         'response': False,
         'requests_response_code': requests.codes.internal_server_error,
     }),
     ('flock://%s/' % ('t' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
         # force a failure
         'response': False,
         'requests_response_code': requests.codes.internal_server_error,
     }),
     ('flock://%s/' % ('t' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
         # throw a bizzare code forcing us to fail to look it up
         'response': False,
         'requests_response_code': 999,
     }),
     ('flock://%s/' % ('t' * 24), {
-        'instance': plugins.NotifyFlock,
+        'instance': NotifyFlock,
         # Throws a series of connection and transfer exceptions when this flag
         # is set and tests that we gracfully handle them
         'test_requests_exceptions': True,
@@ -171,7 +172,7 @@ def test_plugin_flock_edge_cases(mock_post, mock_get, no_throttling):
 
     # Initializes the plugin with an invalid token
     with pytest.raises(TypeError):
-        plugins.NotifyFlock(token=None)
+        NotifyFlock(token=None)
     # Whitespace also acts as an invalid token value
     with pytest.raises(TypeError):
-        plugins.NotifyFlock(token="   ")
+        NotifyFlock(token="   ")