Port to gtk3

[vvug]

GTK2 is old and nowadays a theming nightmare.
Please port hexchat to GTK3.

[learn-more]

Feel free to submit a pull request.

[vvug]

I'm not able to, I contribute on downstream packaging but I can't code that much. I didn't want to be rude, I just think it's important and I found no specific issue on porting to gtk3.

[deviousgeek]

I believe it's just a lot of effort to move everything across. Feel free to fork and maybe I'll help out too!

[TingPing]

menu.c is needs some work and xtext.c needs a ton of work.

If somebody wants to rebase https://github.com/hexchat/hexchat/tree/xtext-cairo

Or ideally rewrite based on the improvements here: https://github.com/leeter/hexchat/blob/cpp-dev/src/fe-gtk/xtext.cpp