[misc bug fixes]

properly hide broadcast failure messages if ignore connection lost is turned on
fix concurent issue for update stats history that happened with new event processing
make get/set additional property thread safe
add ellipse to truncated chat messages on home

Tests/ApplicationTests/Mocks/DatabaseContextFactoryMock.cs

@@ -0,0 +1,32 @@
+using Microsoft.EntityFrameworkCore;
+using SharedLibraryCore.Database;
+using SharedLibraryCore.Interfaces;
+using System;
+
+namespace ApplicationTests.Mocks
+{
+    class DatabaseContextFactoryMock : IDatabaseContextFactory
+    {
+        private DatabaseContext ctx;
+        private readonly IServiceProvider _serviceProvider;
+
+        public DatabaseContextFactoryMock(IServiceProvider sp)
+        {
+            _serviceProvider = sp;
+        }
+
+        public DatabaseContext CreateContext(bool? enableTracking)
+        {
+            if (ctx == null)
+            {
+                var contextOptions = new DbContextOptionsBuilder<DatabaseContext>()
+                    .UseInMemoryDatabase(databaseName: "database")
+                    .Options;
+
+                ctx = new DatabaseContext(contextOptions);
+            }
+
+            return ctx;
+        }
+    }
+}