Themes: add possibility to enable terrain, some fixes to overlaymap and pitch control

src/Models/ThemeConfig/Json/LayoutConfigJson.ts

@@ -388,6 +388,18 @@ export interface LayoutConfigJson {
      */
     enableNoteImports?: true | boolean
 
+    /**
+     * question: Should the map use elevation data to give a 3D-feel?
+     *
+     * This is especially useful for hiking maps, skiing maps etc...
+     *
+     * funset: MapComplete default: don't use terrain
+     * iftrue: Use elevation and render 3D
+     * iffalse: Do not use terrain
+     * group: advanced
+     */
+    enableTerrain?: false | boolean
+
     /**
      * question: What overpass-api instance should be used for this layout?
      *