feat: Resolve all deprecation warnings for sass

- Replace @import with @use and @forward
- Only color function is used in _basic.scss for now
- Change _all.scss to _index.scss
- Modules use direct dependencies
- Move @include from _config.scss to _common.scss, this was a long term mistake
- Remove $color_list
- Change basic_color()

mixins/_user_agent.scss

@@ -1,9 +1,9 @@
-@mixin overrideUserAgent() {
-  @if $no_agent_focus == true {
-    @each $el in $io_focus_list {
-      #{$el}:focus {
-        outline: 0;
-      }
-    }
-  }
+@mixin overrideUserAgent($active, $elements) {
+	@if $active == true {
+		@each $el in $elements {
+			#{$el}:focus {
+				outline: 0;
+			}
+		}
+	}
 }