Refactoring: move all code files into a src directory

src/UI/Base/LoginButton.svelte

@@ -0,0 +1,17 @@
+<script lang="ts">
+  import { OsmConnection } from "../../Logic/Osm/OsmConnection"
+  import Translations from "../i18n/Translations.js"
+  import Tr from "./Tr.svelte"
+  import ToSvelte from "./ToSvelte.svelte"
+  import Svg from "../../Svg"
+
+  export let osmConnection: OsmConnection
+  export let clss: string | undefined = undefined
+</script>
+
+<button class={clss} on:click={() => osmConnection.AttemptLogin()}>
+  <ToSvelte construct={Svg.login_svg().SetClass("w-12 m-1")} />
+  <slot name="message">
+    <Tr t={Translations.t.general.loginWithOpenStreetMap} />
+  </slot>
+</button>