TYPO3 Core

I would appreciate it, if you could define an error page,
which gets displayed if an error occurs, for every domain.

In fact it would be great to be able to define this page
in a domain record, to be able to use different pages
for every domain configured via a domain record.

Furthermore it may make sense to introduce a simple
404 or error plugin which could be placed as a content
element on this error page to serve the error information
to the user plus inform him about possible actions.

I'm working on this extension, but the architecture of
tslib_fe.php is kinda complex and not well structured,
so it's VERY complicated to implement a robust
and ALWAYS working error page.
(issue imported from #M12264)