App architecture modifications.

Now GUI and the app itself is divided into two different binaries.
The app also provides system tray icon.
Whereas the GUI can be used to configure the app.

gui/src/components/Header.svelte

@@ -0,0 +1,28 @@
+<script lang="ts">
+    import { invoke } from "@tauri-apps/api/tauri"
+    import { Dashboard, Gear } from 'radix-icons-svelte'
+    import {isActive} from '@roxi/routify'
+
+    let app_version = "";
+
+    (async () => {
+        app_version = await invoke("get_app_version")
+    })().catch(err => {
+        console.error(err);
+    });
+</script>
+<header id="header">
+    <div class="logo">
+        <a href="/" title="Проект канала Хауди Хо!"><img src="/media/header-logo.png" alt=""></a>
+        <div>
+            <h1><a href="/">JARVIS</a></h1>
+            <h2>v{app_version} <small style="color: #8AC832;opacity: .9;font-size: 13px;">BETA</small></h2>
+        </div>
+    </div>
+    <nav class="top-menu">
+        <ul>
+            <li><a href="/commands" class:active={$isActive('/commands')}><Dashboard /> Команды</a></li>
+            <li><a href="/settings" class:active={$isActive('/settings')}><Gear /> Настройки</a></li>
+        </ul>
+    </nav>
+</header>