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.Devices.WS281X/WS281XDeviceProvider.cs

@@ -27,6 +27,9 @@ namespace Artemis.Plugins.Devices.WS281X
         public override void EnablePlugin()
         {
             var definitions = Settings.GetSetting<List<DeviceDefinition>>("DeviceDefinitions");
+            if (definitions.Value == null)
+                definitions.Value = new List<DeviceDefinition>();
+
             foreach (var deviceDefinition in definitions.Value)
             {
                 switch (deviceDefinition.Type)

src/Plugins/Artemis.Plugins.Devices.WS281X/plugin.json

@@ -1,6 +1,7 @@
 {
   "Guid": "ec86de32-1010-4bf7-97d7-1dcc46659ab6",
   "Name": "WS281X Devices",
+  "Description": "Allows Artemis to control WS281X lighting strips via an Arduino or BitWizard.",
   "Version": "1.0.0.0",
   "Main": "Artemis.Plugins.Devices.WS281X.dll"
 }