Bug 383472

Right now, opening an ISO in Dolphin results in it being passed off to Ark, which cannot mount the ISO--it can only display and offer to extract its contents, which is almost never what's expected or wanted for an ISO. Instead, the user probably wants to mount the ISO.

There are supposedly Dolphin servicemenu add-ons that will accomplish this, but there are two problems with this approach:
1. None of them work for me; they don't even show up once installed
2. Even if they did work, they're 3rd-party software that 99.9% of users will never know about
3. This is basic functionality (macOS finder, Windows Explorer, and GNOME Nautilus can all mount ISOs natively). Iyt seems silly for it to only be supported via 3rd party code.


There are a lot of requests for built-in ISO mounting support in Dolphin:
- https://bugs.kde.org/show_bug.cgi?id=159478
- https://bugs.kde.org/show_bug.cgi?id=175051
- https://bugs.kde.org/show_bug.cgi?id=187880
- https://bugs.kde.org/show_bug.cgi?id=337746

I think it's time to implement it natively. Not having this piece of basic functionality built in frustrates users and degrades Dolphin's user experience.