Add custom refresh rate mode to VSync option (#238)

Rebased @jcm93's refreshinterval branch:
https://github.com/jcm93/Ryujinx/tree/refreshinterval

The option is placed under System/Hacks. Disabled, it's the default
Ryujinx behavior. Enabled, the behavior is shown in the attached
screenshots. If a framerate is too high or low, you can adjust the value
where you normally toggle VSync on and off. It will also cycle through
the default on/off toggles.

Also, in order to reduce clutter, I made an adjustment to remove the
target FPS and only show the percentage.

---------

Co-authored-by: jcm <6864788+jcm93@users.noreply.github.com>

src/Ryujinx.Graphics.GAL/IWindow.cs

@@ -8,7 +8,7 @@ namespace Ryujinx.Graphics.GAL
 
         void SetSize(int width, int height);
 
-        void ChangeVSyncMode(bool vsyncEnabled);
+        void ChangeVSyncMode(VSyncMode vSyncMode);
 
         void SetAntiAliasing(AntiAliasing antialiasing);
         void SetScalingFilter(ScalingFilter type);

src/Ryujinx.Graphics.GAL/Multithreading/ThreadedWindow.cs

@@ -31,7 +31,7 @@ namespace Ryujinx.Graphics.GAL.Multithreading
             _impl.Window.SetSize(width, height);
         }
 
-        public void ChangeVSyncMode(bool vsyncEnabled) { }
+        public void ChangeVSyncMode(VSyncMode vSyncMode) { }
 
         public void SetAntiAliasing(AntiAliasing effect) { }
 

src/Ryujinx.Graphics.GAL/VSyncMode.cs

@@ -0,0 +1,9 @@
+namespace Ryujinx.Graphics.GAL
+{
+    public enum VSyncMode
+    {
+        Switch,
+        Unbounded,
+        Custom
+    }
+}