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_notica.py

@@ -23,7 +23,8 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 import requests
-from apprise import plugins
+
+from apprise.plugins.NotifyNotica import NotifyNotica
 from helpers import AppriseURLTester
 
 # Disable logging for a cleaner testing output
@@ -40,90 +41,90 @@ apprise_url_tests = (
     }),
     # Native URL
     ('https://notica.us/?%s' % ('z' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
 
         # Our expected url(privacy=True) startswith() response:
         'privacy_url': 'notica://z...z/',
     }),
     # Native URL with additional arguments
     ('https://notica.us/?%s&overflow=upstream' % ('z' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
 
         # Our expected url(privacy=True) startswith() response:
         'privacy_url': 'notica://z...z/',
     }),
     # Token specified
     ('notica://%s' % ('a' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
 
         # Our expected url(privacy=True) startswith() response:
         'privacy_url': 'notica://a...a/',
     }),
     # Self-Hosted configuration
     ('notica://localhost/%s' % ('b' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
     }),
     ('notica://user@localhost/%s' % ('c' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
     }),
     ('notica://user:pass@localhost/%s/' % ('d' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
 
         # Our expected url(privacy=True) startswith() response:
         'privacy_url': 'notica://user:****@localhost/d...d',
     }),
     ('notica://user:pass@localhost/a/path/%s/' % ('r' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
 
         # Our expected url(privacy=True) startswith() response:
         'privacy_url': 'notica://user:****@localhost/a/path/r...r',
     }),
     ('notica://localhost:8080/%s' % ('a' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
     }),
     ('notica://user:pass@localhost:8080/%s' % ('b' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
     }),
     ('noticas://localhost/%s' % ('j' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
         'privacy_url': 'noticas://localhost/j...j',
     }),
     ('noticas://user:pass@localhost/%s' % ('e' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
 
         # Our expected url(privacy=True) startswith() response:
         'privacy_url': 'noticas://user:****@localhost/e...e',
     }),
     ('noticas://localhost:8080/path/%s' % ('5' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
         'privacy_url': 'noticas://localhost:8080/path/5...5',
     }),
     ('noticas://user:pass@localhost:8080/%s' % ('6' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
     }),
     ('notica://%s' % ('b' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
         # don't include an image by default
         'include_image': False,
     }),
     # Test Header overrides
     ('notica://localhost:8080//%s/?+HeaderKey=HeaderValue' % ('7' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
     }),
     ('notica://%s' % ('c' * 6), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
         # force a failure
         'response': False,
         'requests_response_code': requests.codes.internal_server_error,
     }),
     ('notica://%s' % ('d' * 7), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
         # throw a bizzare code forcing us to fail to look it up
         'response': False,
         'requests_response_code': 999,
     }),
     ('notica://%s' % ('e' * 8), {
-        'instance': plugins.NotifyNotica,
+        'instance': NotifyNotica,
         # Throws a series of connection and transfer exceptions when this flag
         # is set and tests that we gracfully handle them
         'test_requests_exceptions': True,