ags: config option for symbolic icon theme (#547)

.config/ags/scss/_lib_mixins.scss

@@ -29,9 +29,9 @@ $rounding_large: 1.705rem;
     -gtk-outline-radius: 9999px;
 }
 
-@mixin symbolic-icon {
-    -gtk-icon-theme: 'Adwaita';
-}
+// @mixin symbolic-icon {
+//    -gtk-icon-theme: 'Adwaita';
+// }
 
 @mixin titlefont {
     // Geometric sans-serif

.config/ags/scss/main.scss

@@ -8,6 +8,7 @@
 @import 'material'; // Material colors
 @import './colors'; // Global color definitions. Uses material colors as base.
 @import './lib_mixins';
+@import 'lib_mixins_overrides';
 @import './lib_classes';
 @import './common'; // Context menu n stuff