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

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

public/js/emailsettings.js

@@ -0,0 +1,23 @@
+$(function() {
+
+function toggleIncomingOptions() {
+    var enabled = $('#emailpost').prop('checked', true);
+    if (enabled) {
+        // Note: button style currently does not respond to disabled in our main themes.
+        // Graying out the whole section with a 50% transparency will do for now. :)
+        // @todo: add a general 'disabled' class style to the base themes.
+        $('#emailincoming').css('opacity', '')
+                           .find('input').prop('disabled', false);
+    } else {
+        $('#emailincoming').css('opacity', '0.5')
+                           .find('input').prop('disabled', true);
+    }
+}
+
+toggleIncomingOptions();
+
+$('#emailpost').click(function() {
+    toggleIncomingOptions();
+});
+
+});