Modularize some map-related files (#3154)

app/src/google/java/com/geeksville/mesh/model/map/CustomTileSource.kt

@@ -1,27 +0,0 @@
-/*
- * Copyright (c) 2025 Meshtastic LLC
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.geeksville.mesh.model.map
-
-class CustomTileSource {
-
-    companion object {
-        fun getTileSource(index: Int) {
-            index
-        }
-    }
-}