Test Coverage and Code Tidy

[caronc]

Description:

Related issue (if applicable): n/a

Just some code cleanup; inline documentation updates, spelling errors and more test coverage

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@code-cleanup

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  <apprise url related to ticket>

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (524eba6) 99.52% compared to head (693b66c) 99.55%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1015      +/-   ##
==========================================
+ Coverage   99.52%   99.55%   +0.02%     
==========================================
  Files         129      129              
  Lines       17189    17185       -4     
  Branches     3510     3508       -2     
==========================================
+ Hits        17107    17108       +1     
+ Misses         70       68       -2     
+ Partials       12        9       -3     

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