- More code cleanup and codestyle updates

- Fixed some possible nullref exceptions
- Methods signatures now have up to 3 parameters before breakaing down each parameter in a separate line
- Method invocations have the same rule, except the first parameter will be in the same line as the invocation to prevent some ugliness when passing lambas as arguments
- Applied many more codestyles
- Extensions folder fully reformatted

src/NadekoBot/Modules/Games/PollCommands.cs

@@ -12,9 +12,7 @@ public partial class Games
         private readonly DiscordSocketClient _client;
 
         public PollCommands(DiscordSocketClient client)
-        {
-            _client = client;
-        }
+            => _client = client;
 
         [NadekoCommand, Aliases]
         [UserPerm(GuildPerm.ManageMessages)]