Standardise & styles and improve performance on small displays.

Add inter-route linking from Junctions.

src/lib/components/mapIcons/Junction.svelte

@@ -6,6 +6,8 @@
 		direction: 'up' | 'down';
 		diverges: 'left' | 'right' | 'both';
 		elecBranch?: string;
+		goto?: string;
+		entryPoint?: string;
 	};
 	export let activeElec: any;
 	export let reversed: boolean = false;