Herald v2 (#74)

* Add speech rate setting

* Add volume slider

* New speech manager skeleton

* User API key from resx

* Implement voice list retrieve via new api

* Rewrite to use ObAPI, remove all dependancies

* Use volume setting

* Clean up using statements

* Volume and timing adjustments

* Lookup rate value

* Use numeric rates for tighter spread

* Manage plugin data folder via core interface

* Add check that nullable settings are not null.

* Get file size before it's deleted.

* Improve old settings migration.

* Ignore cache sizes below 1MB

* Re-index orphaned files in cache, purge legacy wav files.

* Call top level error logging for native voice exception.

* Async title and detail requests to remove pause

* Remove NetCoreAudio use of temp files.

* Remove orphan using.

ObservatoryCore/NativeNotification/NativeVoice.cs

@@ -32,7 +32,14 @@ namespace Observatory.NativeNotification
 
         private async void ProcessQueueAsync()
         {
-            await Task.Factory.StartNew(ProcessQueue);
+            try
+            {
+                await Task.Factory.StartNew(ProcessQueue);
+            }
+            catch (System.Exception ex)
+            {
+                ObservatoryCore.LogError(ex, " - Native Voice Notifier");
+            }
         }
 
         private void ProcessQueue()