Support Global System (Apprise) Configuration

[caronc]

Description:

Related issue (if applicable): #872

The request was to allow for global configuration references. This only impacts the CLI (apprise) and is only factored in alike the rest of the default configuration. Hence it is only applied if no other configuration wasn't otherwise specified.

All user bound configuration is always checked first before the information below is checked.

Added the following:
For Linux:

• Configuration:
  • /etc/apprise
  • /etc/apprise.yml
  • /etc/apprise/apprise
  • /etc/apprise/apprise.yml
• Plugin Path:
  • /var/lib/apprise/plugins/

For Microsoft Windows:

• Configuration (processed in the following order after not finding a local copy):
  • %ALLUSERSPROFILE%\Apprise\apprise (roughly translates to C:\ProgramData\Apprise\apprise)
  • %ALLUSERSPROFILE%\Apprise\apprise.yml (roughly translates to C:\ProgramData\Apprise\apprise.yml)
  • %PROGRAMFILES%\Apprise\apprise (roughly translates to C:\Program Files\Apprise\apprise)
  • %PROGRAMFILES%\Apprise\apprise.yml (roughly translates to C:\Program Files\Apprise\apprise.yml)
  • %COMMONPROGRAMFILES%\Apprise\apprise (roughly translates to C:\Program Files\Common Files\Apprise\apprise)
  • %COMMONPROGRAMFILES%\Apprise\apprise.yml (roughly translates to C:\Program Files\Common Files\Apprise\apprise.yml)
• Plugin Path: /var/lib/apprise/plugins/
  • %ALLUSERSPROFILE%\Apprise\plugins (roughly translates to C:\ProgramData\Apprise\plugins)
  • %PROGRAMFILES%\Apprise\plugins (roughly translates to C:\Program Files\Apprise\apprise)
  • %COMMONPROGRAMFILES%\Apprise\plugins (roughly translates to C:\Program Files\Common Files\Apprise\plugins)

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@872-global-configuration

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" "schema://"

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e83cba6) 100.00% compared to head (690c6bc) 100.00%.

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #875   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          118       118           
  Lines        15405     15405           
  Branches      3162      3162           
=========================================
  Hits         15405     15405           

Impacted Files	Coverage Δ
apprise/cli.py	100.00% <ø> (ø)

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