Moved between oomox themes

This one's based on Numix, which should look a lot better.

.themes/oomox-numix-gruvbox/gtk-3.20/scss/widgets/_spinner.scss

@@ -0,0 +1,24 @@
+/*******************
+ ! Spinner animation
+********************/
+
+@include exports("spinner") {
+    @keyframes spin {
+        to { -gtk-icon-transform: rotate(1turn); }
+    }
+
+    spinner {
+        background-image: none;
+        color: $selected_bg_color;
+        opacity: 0; // non spinning spinner makes no sense
+
+        -gtk-icon-source: -gtk-icontheme("process-working-symbolic");
+
+        &:checked {
+            opacity: 1;
+            animation: spin 1s linear infinite;
+
+            &:disabled { opacity: .5; }
+        }
+    }
+}