Improve support for spoilers and user mentions

[nebula2]

if we want to use spoilers or mention a user it is required to set useCustomHtmlFormatting in the options and ensure that we escape everything properly each time that we want to log something.

as documented here

we can for example say This is a spoiler:<tg-spoiler></tg-spoiler> or <a href="tg://user?id={userId}">hello</a> to mention a user.

it would be nice to

• either expand this for default support
• or the ability to pass a function for custom html formatting so that the consumer can pass a custom logic which will kind of replace the extension method.

I would like to create a pull request for the second option as it provides more flexibility and less effort for maintainence in this repository.

[SeppPenner]

If you ask me, the best would be to add both of the options: Extend the default behaviour, but make it possible to set a custom logic from the user code. Or am I missing something that this doesn't make sense?

I will have a look at your pull request soon.

[SeppPenner]

The new version containing your changes should be available soon.