Show parts of new URL instead incoming values

[nicodh]

resolves partly #4559

This PR fixes two issues:

• punycode is shown to the user
• detect capital letters looking similar to other lower case letters like capital i looking like lower case L in some font-types (l != I) and show a warning

It does not fix the issue that message parser is too greedy and adds some characters to domain names. (deltachat/message-parser#91)

Before: opening a markup link with trailing )

After:

Clicking a link like https://deIta.chat just opened https://deita.chat

Now:

#skip-changelog

[Simon-Laux]

showing the punycode to the user is intentional - it is a security feature to show the real url instead of what it appears to be: https://en.wikipedia.org/wiki/IDN_homograph_attack

the bug is in the message parser.

[Simon-Laux]

Since there is also deltachat/message-parser#92 (which breaks labeled links with unicode) we could ignore puny code completely for this dialog for now. but we should read it once it is fixed in the message parser -> so if we go that route then please add a comment on the issue I just linked to that we don't forget to re-add it

[nicodh]

showing the punycode to the user is intentional - it is a security feature to show the real url instead of what it appears to be

If any Destination coming from message parser which has a punycode property != undefined is an invalid or suspicious Link, then we should add a condition not go to LabeledLinkConfirmationDialog but always show a warning if it is present.

I saw in the source code that punycode is named PunycodeWarning in message parser, so maybe that would be a better name to understand "from outside" what's behind it

the bug is in the message parser.

yes that's what I wrote in the description

[nicodh]

Waiting for another solution Simon said he is planning to implement