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.

ObservatoryHerald/HeraldSettings.cs

@@ -1,9 +1,6 @@
 using Observatory.Framework;
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace Observatory.Herald
 {
@@ -15,15 +12,40 @@ namespace Observatory.Herald
         [SettingDisplayName("Voice")]
         [SettingBackingValue("SelectedVoice")]
         [System.Text.Json.Serialization.JsonIgnore]
-        public Dictionary<string, object> Voices { get; internal set; }
+        public Dictionary<string, object> Voices {get; internal set;}
 
         [SettingIgnore]
         public string SelectedVoice { get; set; }
 
+        [SettingBackingValue("SelectedRate")]
+        public Dictionary<string, object> Rate
+        { get => new Dictionary<string, object> 
+            {
+                {"Slowest", "0.5"},
+                {"Slower", "0.75"},
+                {"Default", "1.0"},
+                {"Faster", "1.25"},
+                {"Fastest", "1.5"}
+            }; 
+        }
+
+        [SettingIgnore]
+        public string SelectedRate { get; set; }
+
+        [SettingDisplayName("Volume")]
+        [SettingNumericUseSlider, SettingNumericBounds(0,100,1)]
+        public int Volume { get; set;}
+
         [System.Text.Json.Serialization.JsonIgnore]
         public Action Test { get; internal set; }
 
         [SettingDisplayName("Enabled")]
         public bool Enabled { get; set; }
+
+        [SettingIgnore]
+        public string ApiEndpoint { get; set; }
+
+        [SettingDisplayName("Cache Size (MB): ")]
+        public int CacheSize { get; set; }
     }
 }