Plugins - Added descriptions

Settings - Plugin settings tab
UI - Catch exceptions during exception dialog display
Plugins - Implemented enable/disable of plugins (WIP)
Novation - Added Launchpad Mini layout and image

src/Plugins/Artemis.Plugins.LayerBrushes.Color/ColorBrush.cs

@@ -37,7 +37,7 @@ namespace Artemis.Plugins.LayerBrushes.Color
             GradientTypeProperty.ValueChanged += (sender, args) => CreateShader(_shaderBounds);
         }
 
-        private void GradientTypePropertyOnValueChanged(object? sender, EventArgs e)
+        private void GradientTypePropertyOnValueChanged(object sender, EventArgs e)
         {
             throw new NotImplementedException();
         }

src/Plugins/Artemis.Plugins.LayerBrushes.Color/plugin.json

@@ -1,6 +1,7 @@
 {
   "Guid": "92a9d6ba-6f7a-4937-94d5-c1d715b4141a",
   "Name": "Color layer brush",
+  "Description": "A basic color layer-brush providing solid colors and several types of gradients.",
   "Version": "1.0.0.0",
   "Main": "Artemis.Plugins.LayerBrushes.Color.dll"
 }