fix: Unity target (#190)

* fix: unity target and global cleanup method

* fix: doc comment

* fix: added missing project files

.github/workflows/release/versions.json

@@ -39,5 +39,12 @@
       "clearedPrefix": true,
       "clearedSuffix": false
     }
-  ]
+  ],
+  "src/Api/PubnubApiUnity/PubnubApiUnity.csproj": [
+    {
+      "pattern": "^\\s{2,}<PackageVersion>(v?(\\d+\\.?){2,}([a-zA-Z0-9-]+(\\.?\\d+)?)?)<\/PackageVersion>$",
+      "clearedPrefix": true,
+      "clearedSuffix": false
+    }
+  ],
 }

src/Api/PubnubApi/Pubnub.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Globalization;
 using System.Reflection;
+using PubnubApi.EndPoint;
 #if !NET35 && !NET40
 using System.Collections.Concurrent;
 #endif
@@ -18,6 +19,10 @@ public class Pubnub
         private readonly EndPoint.TokenManager tokenManager;
         private object savedSubscribeOperation;
         private readonly string savedSdkVerion;
+
+        #if UNITY
+        private static System.Func<UnsubscribeAllOperation<object>> OnCleanupCall;
+        #endif
 
         static Pubnub() 
         {
@@ -30,6 +35,16 @@ static Pubnub()
 #endif
             Version = string.Format(CultureInfo.InvariantCulture, "{0}CSharp{1}", PNPlatform.Get(), assemblyVersion);
         }
+
+        #if UNITY
+        /// <summary>
+        /// Call this function to globally clean up all background threads running in the SDK. Note that this will unsubscribe all channels.
+        /// </summary>
+        public static void CleanUp()
+        {
+            OnCleanupCall?.Invoke();
+        }
+        #endif
 
         #region "PubNub API Channel Methods"
 
@@ -860,6 +875,10 @@ public void SetJsonPluggableLibrary(IJsonPluggableLibrary customJson)
 
         public Pubnub(PNConfiguration config)
         {
+            #if UNITY
+            OnCleanupCall += this.UnsubscribeAll<object>;
+            #endif
+
             savedSdkVerion = Version;
             InstanceId = Guid.NewGuid().ToString();
             pubnubConfig.AddOrUpdate(InstanceId, config, (k, o) => config);
@@ -905,6 +924,13 @@ public Pubnub(PNConfiguration config)
 
         }
 
+        #if UNITY
+        ~Pubnub()
+        {
+            OnCleanupCall -= this.UnsubscribeAll<object>;
+        }
+        #endif
+
         private void CheckRequiredConfigValues()
         {
             if (pubnubConfig != null && pubnubConfig.ContainsKey(InstanceId))
@@ -932,5 +958,5 @@ private void CheckRequiredConfigValues()
         }
 
 #endregion
-	}
+    }
 }