miskey:// visibility flags updated

[caronc]

Description:

Related issue (if applicable): #1251

Misskey appears to have changed it's supported flags around. Using 2 sources, there are conflicts even with those.

Source 1: https://misskey-hub.net/en/docs/for-users/features/note/

Source 2: https://docs.rs/misskey-api/latest/misskey_api/model/note/enum.Visibility.html

Source 2 provides actual Enum values, so will adapt on this for this PR.

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@1251-misskey-visibility

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.36%. Comparing base (551fa0d) to head (514077a).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1257      +/-   ##
==========================================
- Coverage   99.36%   99.36%   -0.01%     
==========================================
  Files         159      159              
  Lines       20687    20686       -1     
  Branches     3715     3715              
==========================================
- Hits        20556    20555       -1     
  Misses        121      121              
  Partials       10       10              

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[Albirew]

I believe Source 1 is meant for end-users (Misskey webclient) and Source 2 for API calls.

Tried locally, worked with "specified" visibility flag. Worked as intended for private.

LGTM