[twitter] rename binding to X (#15809)

Signed-off-by: Leo Siepel <leosiepel@gmail.com>

bundles/org.openhab.binding.x/NOTICE

@@ -0,0 +1,22 @@
+This content is produced and maintained by the openHAB project.
+
+* Project home: https://www.openhab.org
+
+== Declared Project Licenses
+
+This program and the accompanying materials are made available under the terms
+of the Eclipse Public License 2.0 which is available at
+https://www.eclipse.org/legal/epl-2.0/.
+
+== Source Code
+
+https://github.com/openhab/openhab-addons
+
+== Third-party Content
+
+twitter4j
+* License: Apache License 2.0
+* Project: https://twitter4j.org/
+* Source:  https://github.com/Twitter4J/Twitter4J
+
+