Add frontend assets and plugin bundles

Add the legacy frontend themes, scripts, and plugin assets required by the main SPOTA interfaces.

assets/plugins/iCheck/skins/flat/red.css

@@ -0,0 +1,54 @@
+/* iCheck plugin Flat skin, red
+----------------------------------- */
+.icheckbox_flat-red,
+.iradio_flat-red {
+    display: block;
+    margin: 0;
+    padding: 0;
+    width: 20px;
+    height: 20px;
+    background: url(red.png) no-repeat;
+    border: none;
+    cursor: pointer;
+}
+
+.icheckbox_flat-red {
+    background-position: 0 0;
+}
+    .icheckbox_flat-red.checked {
+        background-position: -22px 0;
+    }
+    .icheckbox_flat-red.disabled {
+        background-position: -44px 0;
+        cursor: default;
+    }
+    .icheckbox_flat-red.checked.disabled {
+        background-position: -66px 0;
+    }
+
+.iradio_flat-red {
+    background-position: -88px 0;
+}
+    .iradio_flat-red.checked {
+        background-position: -110px 0;
+    }
+    .iradio_flat-red.disabled {
+        background-position: -132px 0;
+        cursor: default;
+    }
+    .iradio_flat-red.checked.disabled {
+        background-position: -154px 0;
+    }
+
+/* Retina support */
+@media only screen and (-webkit-min-device-pixel-ratio: 1.5),
+       only screen and (-moz-min-device-pixel-ratio: 1.5),
+       only screen and (-o-min-device-pixel-ratio: 3/2),
+       only screen and (min-device-pixel-ratio: 1.5) {
+    .icheckbox_flat-red,
+    .iradio_flat-red {
+        background-image: url(red@2x.png);
+        -webkit-background-size: 176px 22px;
+        background-size: 176px 22px;
+    }
+}