Issue #1285726 by kim.pepper, InternetDevels, alexpott, RobLoach: Remove XML-RPC.

core/CHANGELOG.txt

core/MAINTAINERS.txt

core/modules/system/core.api.php

...odules/system/src/Tests/Bootstrap/GetFilenameUnitTest.php

.../modules/system/src/Tests/Extension/ModuleHandlerTest.php

core/modules/xmlrpc/src/Controller/XmlrpcController.php

core/modules/xmlrpc/src/Tests/XmlRpcBasicTest.php

core/modules/xmlrpc/src/Tests/XmlRpcMessagesTest.php

core/modules/xmlrpc/src/Tests/XmlRpcValidatorTest.php

...les/xmlrpc/tests/modules/xmlrpc_test/xmlrpc_test.info.yml

...dules/xmlrpc/tests/modules/xmlrpc_test/xmlrpc_test.module

core/modules/xmlrpc/xmlrpc.api.php

core/modules/xmlrpc/xmlrpc.inc

core/modules/xmlrpc/xmlrpc.info.yml

core/modules/xmlrpc/xmlrpc.module

core/modules/xmlrpc/xmlrpc.routing.yml

core/modules/xmlrpc/xmlrpc.server.inc

core/scripts/run-tests.sh