feat: Update to .io styles

- Combine element definitions for margin
- Add label handling
- Add .group for combinations with gap in between

modules/io/_io_module.scss

@@ -6,12 +6,16 @@ header,
 aside,
 footer {
 	&.io {
-		nav li {
+		nav {
+			li,
+			label,
+			input[type="range"] {
 				margin: 0;
 			}
+		}
 
-		nav>div:not(.spacer),
 		nav>span,
+		nav label,
 		.a_button {
 			@extend %basic;
 			@extend %size_io_button;
@@ -21,12 +25,13 @@ footer {
 			@extend .button_io;
 		}
 
-		input:not([type="range"]) {
+		.group {
-			@extend .input_io;
+			display: flex;
+			flex-flow: row nowrap;
 		}
 
-		input[type="range"] {
+		input:not([type="range"]) {
-			margin: 0;
+			@extend .input_io;
 		}
 
 		select {