[CORE][COMPOSER] Move extlib packages with immediate composer correspondent to composer dependencies

This adds a composer.json for all dependencies that are available

public/plugins/Poll/css/poll.css

@@ -0,0 +1,20 @@
+/* Poll specific styles */
+
+.poll-block {
+    float: left;
+    height: 16px;
+    background: #8aa;
+    margin-right: 8px;
+}
+
+.poll-winner {
+    background: #4af;
+}
+
+.notice div.poll-content {
+    opacity: 1;
+}
+
+#poll-response-submit {
+    min-width: 100px;
+}