Switching master branch to .NET8

[kenkendk]

@npodbielski

I do not know why I do not get mail notifications anymore.

There was a problem after moving the forum, but it should be fixed.

@npodbielski

Can you tell me if you can run backup/restore operation on .net8 version? I am trying right now write selenium tests to do that in an automated way. If this is not possible I would rather merge my changes sooner rather than later.

Yes, the CI tests are passing backup+restore, the Selenium tests are passing and my manual tests are passing. Note that this is with the HttpServer and the RestAPI.

@npodbielski

I.e. I fixed handling of XSFR errors to be done during request in AppService.js instead of in various places on the FE, by i.e. showing annoying modal window.

Sound great!

@npodbielski

Looking how LegacyHttpResponseShim is used (with NotImplementexExceptions) I am not sure if .net8 will work at all in that state.

The WebserverCore project is not used by the old HttpServer (using Duplicati.Library.RestAPI).
I am not sure about the LegacyHttpResponseShim intended future role. Maybe @tsuckow has some insights?