More refactoring, move minimap behind facade

Models/ThemeConfig/Json/LayerConfigJson.ts

@@ -59,10 +59,9 @@ export interface LayerConfigJson {
      * NOTE: the previous format was 'overpassTags: AndOrTagConfigJson | string', which is interpreted as a shorthand for source: {osmTags: "key=value"}
      *  While still supported, this is considered deprecated
      */
-    source: { osmTags: AndOrTagConfigJson | string } |
-        { osmTags: AndOrTagConfigJson | string, geoJson: string, geoJsonZoomLevel?: number, isOsmCache?: boolean } |
-        { osmTags: AndOrTagConfigJson | string, overpassScript: string }
-
+    source: { osmTags: AndOrTagConfigJson | string, overpassScript?: string  } |
+        { osmTags: AndOrTagConfigJson | string, geoJson: string, geoJsonZoomLevel?: number, isOsmCache?: boolean }
+    
     /**
      *
      * A list of extra tags to calculate, specified as "keyToAssignTo=javascript-expression".

Models/ThemeConfig/LayoutConfig.ts

@@ -246,14 +246,6 @@ export default class LayoutConfig {
         return icons
     }
 
-    public LayerIndex(): Map<string, LayerConfig> {
-        const index = new Map<string, LayerConfig>();
-        for (const layer of this.layers) {
-            index.set(layer.id, layer)
-        }
-        return index;
-    }
-
     /**
      * Replaces all the relative image-urls with a fixed image url
      * This is to fix loading from external sources

Models/ThemeConfig/SourceConfig.ts

@@ -2,18 +2,18 @@ import {TagsFilter} from "../../Logic/Tags/TagsFilter";
 
 export default class SourceConfig {
 
-    osmTags?: TagsFilter;
-    overpassScript?: string;
-    geojsonSource?: string;
-    geojsonZoomLevel?: number;
-    isOsmCacheLayer: boolean;
+    public readonly osmTags?: TagsFilter;
+    public readonly overpassScript?: string;
+    public readonly geojsonSource?: string;
+    public readonly geojsonZoomLevel?: number;
+    public readonly isOsmCacheLayer: boolean;
 
     constructor(params: {
         osmTags?: TagsFilter,
         overpassScript?: string,
         geojsonSource?: string,
         isOsmCache?: boolean,
-        geojsonSourceLevel?: number
+        geojsonSourceLevel?: number,
     }, context?: string) {
 
         let defined = 0;