Fixed NullReferenceExcepton in Socket.Connect for non-IP endpoints

Socket.Connect(EndPoint) throws a NullReferenceException when connecting to non-IP (eg Unix) endpoints in Dgram mode.
[mcs] Flow analysis of moved arguments. Fixes #20983
Add a build status badge to README.md.
Merge pull request #1124 from UCIS/patch-5

Fixed NullReferenceExcepton in Socket.Connect for non-IP endpoints
[System.Web] Remove superfluous write to file in test

The written file is never used, all the Asserts happen in RenderPostBackEvent_OnSaveStateComplete ().
[MWF] Get rid of unused resx.resx file

The other tests already use GetResXFileWithNode () to create this file, make this consistent and get rid of the checked-in file
[System.IO.Compression] Delete test file after test
[System.Drawing] Delete test files after test
[mdoc] Ignore generated test files