Fixed around 140 wrong namings and other refactorings which were marked as warnings

src/NadekoBot.Tests/BotStringsTests.cs

@@ -40,7 +40,7 @@ namespace NadekoBot.Tests
         }
 
         private static string[] GetCommandMethodNames()
-            => typeof(NadekoBot.Bot).Assembly
+            => typeof(Bot).Assembly
                 .GetExportedTypes()
                 .Where(type => type.IsClass && !type.IsAbstract)
                 .Where(type => typeof(NadekoModule).IsAssignableFrom(type) // if its a top level module

src/NadekoBot.Tests/GroupGreetTests.cs

@@ -1,5 +1,3 @@
-using System.Collections;
-using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using NadekoBot.Extensions;
@@ -14,9 +12,7 @@ namespace NadekoBot.Tests
 
         [SetUp]
         public void Setup()
-        {
-            _grouper = new GreetGrouper<int>();
-        }
+            => _grouper = new GreetGrouper<int>();
 
         [Test]
         public void CreateTest()

src/NadekoBot.Tests/IndexedCollectionTests.cs

@@ -115,7 +115,7 @@ namespace NadekoBot.Tests
         [Test]
         public void ContainsTest()
         {
-            var subCol = new ShopEntry[]
+            var subCol = new[]
             {
                 new ShopEntry() { Id = 111 },
                 new ShopEntry() { Id = 222 },

src/NadekoBot.Tests/KwumTests.cs

@@ -1,5 +1,4 @@
-using System.Linq;
-using NadekoBot.Common;
+using NadekoBot.Common;
 using NUnit.Framework;
 
 namespace NadekoBot.Tests

src/NadekoBot.Tests/Random.cs

@@ -9,10 +9,8 @@ namespace NadekoBot.Tests
     {
         [SetUp]
         public void Setup()
-        {
-            Console.OutputEncoding = Encoding.UTF8;
-        }
-        
+            => Console.OutputEncoding = Encoding.UTF8;
+
         [Test]
         public void Utf8CodepointsToEmoji()
         {