Weechat: Add support for explicit hyperlink marking in terminals that support it.

[offbyone]

Feature description

When hyperlinks are posted to terminals it's super useful to be able to click on them. Most modern terminals provide URL marking features to make that possible, but they rely on text continuity, and when URLs wrap in sub-panes of the terminal window that gets hard, if not straight up impossible.

See, for example, this issue I opened to iTerm2: https://gitlab.com/gnachman/iterm2/issues/7066

They point out that there's a nascent standard implemented by them and by Gnome terminal, OSC 8 explicit hyperlink support, that allows for HTML-like anchors to mark links.

Please implement that in weechat so that I can click on my URLs again 😄

[jpmenil]

Still not clickable with alt+l ?
cf https://weechat.org/files/doc/devel/weechat_faq.en.html#urls

[offbyone]

Yeah, that works... I'm not sure it removes the value of my feature request, though.

[sataris]

This would be wonderful to see implemented, alt+l is an annoying workaround.

[jpmenil]

another workaround, is tmux + tmux-url-select.pl or another tmux url plugin