Added and applied styles for private readonly fields, private fields to Extensions and Common folders.

- Some renamings and code cleanups
- Chained method calls, binary expressions and binary patterns will now break into newlines
- Type param constraints and base constructor calls will be on the new line

src/NadekoBot/Common/DownloadTracker.cs

@@ -3,7 +3,7 @@
 public class DownloadTracker : INService
 {
     private ConcurrentDictionary<ulong, DateTime> LastDownloads { get; } = new();
-    private readonly SemaphoreSlim downloadUsersSemaphore = new(1, 1);
+    private readonly SemaphoreSlim _downloadUsersSemaphore = new(1, 1);
 
     /// <summary>
     /// Ensures all users on the specified guild were downloaded within the last hour. 
@@ -12,16 +12,16 @@ public class DownloadTracker : INService
     /// <returns>Task representing download state</returns>
     public async Task EnsureUsersDownloadedAsync(IGuild guild)
     {
-        await downloadUsersSemaphore.WaitAsync();
+        await _downloadUsersSemaphore.WaitAsync();
         try
         {
             var now = DateTime.UtcNow;
 
             // download once per hour at most
-            var added = LastDownloads.AddOrUpdate(
-                guild.Id,
+            var added = LastDownloads.AddOrUpdate(guild.Id,
                 now,
-                (key, old) => now - old > TimeSpan.FromHours(1) ? now : old);
+                (_, old) => now - old > TimeSpan.FromHours(1) ? now : old
+            );
 
             // means that this entry was just added - download the users
             if (added == now)
@@ -29,7 +29,7 @@ public class DownloadTracker : INService
         }
         finally
         {
-            downloadUsersSemaphore.Release();
+            _downloadUsersSemaphore.Release();
         }
     }
 }