Avalonia: Clean up leftover RenderTimer & Fix minimum and initial window size (#3935)

* ava: Cleanup RenderTimer

* ava: Remove ContentControl from RendererHost

* ava: Remove unused actual scale factor

* ava: Enable UseGpu for Linux

* ava: Set better initial size & Scale the window properly

* ava: Realign properties

* ava: Use explicit type & specify where the note applies

Ryujinx.Ava/Ui/Controls/RenderTimer.cs

@@ -1,100 +0,0 @@
-using Avalonia.Rendering;
-using System;
-using System.Threading;
-using System.Timers;
-
-namespace Ryujinx.Ava.Ui.Controls
-{
-    internal class RenderTimer : IRenderTimer, IDisposable
-    {
-        public event Action<TimeSpan> Tick
-        {
-            add
-            {
-                _tick += value;
-
-                if (_subscriberCount++ == 0)
-                {
-                    Start();
-                }
-            }
-
-            remove
-            {
-                if (--_subscriberCount == 0)
-                {
-                    Stop();
-                }
-
-                _tick -= value;
-            }
-        }
-
-        private Thread _tickThread;
-        private readonly System.Timers.Timer _timer;
-
-        private Action<TimeSpan> _tick;
-        private int _subscriberCount;
-
-        private bool _isRunning;
-
-        private AutoResetEvent _resetEvent;
-
-        public RenderTimer()
-        {
-            _timer = new System.Timers.Timer(15);
-            _resetEvent = new AutoResetEvent(true);
-            _timer.Elapsed += Timer_Elapsed;
-        }
-
-        private void Timer_Elapsed(object sender, ElapsedEventArgs e)
-        {
-            TickNow();
-        }
-
-        public void Start()
-        {
-            _timer.Start();
-            if (_tickThread == null)
-            {
-                _tickThread = new Thread(RunTick);
-                _tickThread.Name = "RenderTimerTickThread";
-                _tickThread.IsBackground = true;
-                _isRunning = true;
-                _tickThread.Start();
-            }
-        }
-
-        public void RunTick()
-        {
-            while (_isRunning)
-            {
-                _resetEvent.WaitOne();
-                _tick?.Invoke(TimeSpan.FromMilliseconds(Environment.TickCount));
-            }
-        }
-
-        public void TickNow()
-        {
-            lock (_timer)
-            {
-                _resetEvent.Set();
-            }
-        }
-
-        public void Stop()
-        {
-            _timer.Stop();
-        }
-
-        public void Dispose()
-        {
-            _timer.Elapsed -= Timer_Elapsed;
-            _timer.Stop();
-            _isRunning = false;
-            _resetEvent.Set();
-            _tickThread.Join();
-            _resetEvent.Dispose();
-        }
-    }
-}

Ryujinx.Ava/Ui/Controls/RendererHost.axaml

@@ -4,11 +4,4 @@
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
              x:Class="Ryujinx.Ava.Ui.Controls.RendererHost">
-    <ContentControl
-        HorizontalAlignment="Stretch"
-        HorizontalContentAlignment="Stretch"
-        VerticalAlignment="Stretch"
-        VerticalContentAlignment="Stretch"
-        Name="View"
-        />
 </UserControl>

Ryujinx.Ava/Ui/Controls/RendererHost.axaml.cs

@@ -41,7 +41,7 @@ namespace Ryujinx.Ava.Ui.Controls
         {
             _currentWindow.WindowCreated += CurrentWindow_WindowCreated;
             _currentWindow.SizeChanged += CurrentWindow_SizeChanged;
-            View.Content = _currentWindow;
+            Content = _currentWindow;
         }
 
         public void CreateVulkan()