Resurrect integrated error display for the Debugger.

[RyanStein]

I have taken a look at how the editor has changed since I originally made this feature(#15272) and found it simpler to just re-write on top of the changes made since. I was able to integrate the right-click error copy as well. No rebase should be necessary.

I made use of @akien-mga 's suggested changes from the branch indicated. We should finally be able to close #15234 and salvage this.

I would appreciate any feedback. Thank you.

Edit: Also fixes #21676

[groud]

Nice, I am very happy you managed to rebase those changes. Thanks for your hard work!

[Chaosus]

I guess this will be fixed too - #21676. Good job !

[RyanStein]

@Chaosus Absolutely. You may click on either the warning itself or the <Source> item to jump immediately to the line in question. The same goes for Errors where applicable, such as each individual stack trace item.

[akien-mga]

Thanks for the contribution, it looks great!

We briefly discussed it on IRC and had some suggestions/concerns, but those can be worked on in follow-up PRs, namely:

• @neikeq wondered how well it will handle C# stacktraces with the current system to identify "C source" as not script-derived
• Options to fold/unfold all errors could be good to add, maybe as buttons below the "Clear" button (Edit: Done Add expand/collapse all buttons for the "Errors" tab #22017)

[ghost]

this is very cool, but i noticed something odd:

previously, if we scrolled all the way down on the scrollbar in the error log, any new errors that would show, would make the scroll bar go down to the bottom automatically.

now, it just stays wherever you left the scrollbar at, and then now you need to scroll down to get to the last error message.