Updated App.axaml

Added Models to XML Namespace.
Set DataType to be AppViewModel
Changed from static tooltip and icon, to using Bindings.

FreeTubeSyncer/App.axaml

@@ -1,7 +1,9 @@
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:sukiUi="clr-namespace:SukiUI;assembly=SukiUI"
+             xmlns:vm="clr-namespace:FreeTubeSyncer.Models"
              x:Class="FreeTubeSyncer.App"
+             x:DataType="vm:AppViewModel"
              RequestedThemeVariant="Dark">
              <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
 
@@ -11,8 +13,8 @@
     
     <TrayIcon.Icons>
         <TrayIcons>
-            <TrayIcon Icon="/Assets/freetube.png"
-                      ToolTipText="FreeTube Syncer"
+            <TrayIcon Icon="{Binding AppIcon}"
+                      ToolTipText="{Binding HintTooltip, Mode=TwoWay}"
                       Clicked="TrayIcon_OnClicked">
                 <TrayIcon.Menu>
                     <NativeMenu>