apprise notification format

[vogler]

Seems like not all notification services can deal with HTML.
via https://github.com/vogler/free-games-claimer/pull/417/files#diff-d449836a1265b178db184b204653735df165e83a1b95401942c324ace2b501adR276

Could either just not use HTML at all or strip HTML tags if needed.
However, that would require an exhaustive list of those services.

[vogler]

• https://github.com/caronc/apprise/wiki/Notify_discord supports text, markdown
• https://github.com/caronc/apprise/wiki/Notify_telegram supports text, markdown, html

So one would need to go through all https://github.com/caronc/apprise#supported-notifications and check what formats are supported and map it accordingly.
Ideally, apprise would take care of this since they have all the information. They could always accept HTML or Markdown and convert it to text if needed.

Maybe most services support Markdown and the ones that don't would hopefully just use it as text. Markdown links are not that bad to read as text.

[vogler]

The files in https://github.com/caronc/apprise/tree/master/apprise/plugins don't really specify the supported formats, the code just branches on the passed format.

• Telegram sets a defaultNotifyFormat as HTML: https://github.com/caronc/apprise/blob/9bf45e415ddb7c08decb78029153478ed6bca4a4/apprise/plugins/telegram.py#L145-L146
• Discord doesn't set a default: https://github.com/caronc/apprise/blob/9bf45e415ddb7c08decb78029153478ed6bca4a4/apprise/plugins/discord.py#L291