Refactored Apprise mailto:// and apprise.utils module

[caronc]

Description:

Related issue (if applicable): n/a

• Refactored apprise/utils.py into a cleaner submodule
• Refactored mailto:// and extracted PGP (Pretty Good Privacy) into it's own reusable module.
• mailto:// now has a static method that can be used to generate emails for other mailing services. To be used in GMail OAuth2 Support (gmail://) #1250

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@utils-mailto-refactor

[codecov]

Codecov Report

Attention: Patch coverage is 99.85185% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.36%. Comparing base (4d21759) to head (9f561c8).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
apprise/utils/pgp.py	99.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1255      +/-   ##
==========================================
- Coverage   99.37%   99.36%   -0.01%     
==========================================
  Files         148      159      +11     
  Lines       20776    20687      -89     
  Branches     3709     3715       +6     
==========================================
- Hits        20646    20556      -90     
  Misses        121      121              
- Partials        9       10       +1     

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