Add a new .editorconfig and reformat code (#76)

*I'll start working on features and bugfixes after this PR, I promise*
very short summary:
- no more braceless statements
- braces are on new lines now
- `sealed` on everything that can be `sealed`
- no more awkwardly looking alignment of fields/parameters
- no more `Service` suffix on service fields. yeah.
- no more `else`s. who needs them?
- code style is now enforced by CI

---------

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

src/Responders/MessageReceivedResponder.cs

@@ -11,23 +11,27 @@ namespace Boyfriend.Responders;
 ///     Handles sending replies to easter egg messages.
 /// </summary>
 [UsedImplicitly]
-public class MessageCreateResponder : IResponder<IMessageCreate> {
+public class MessageCreateResponder : IResponder<IMessageCreate>
+{
     private readonly IDiscordRestChannelAPI _channelApi;
 
-    public MessageCreateResponder(IDiscordRestChannelAPI channelApi) {
+    public MessageCreateResponder(IDiscordRestChannelAPI channelApi)
+    {
         _channelApi = channelApi;
     }
 
-    public Task<Result> RespondAsync(IMessageCreate gatewayEvent, CancellationToken ct = default) {
+    public Task<Result> RespondAsync(IMessageCreate gatewayEvent, CancellationToken ct = default)
+    {
         _ = _channelApi.CreateMessageAsync(
-            gatewayEvent.ChannelID, ct: ct, content: gatewayEvent.Content.ToLowerInvariant() switch {
-                "whoami"  => "`nobody`",
+            gatewayEvent.ChannelID, ct: ct, content: gatewayEvent.Content.ToLowerInvariant() switch
+            {
+                "whoami" => "`nobody`",
                 "сука !!" => "`root`",
-                "воооо"   => "`removing /...`",
+                "воооо" => "`removing /...`",
                 "пон" => "https://cdn.upload.systems/uploads/2LNfUSwM.jpg",
                 "++++" => "#",
-                "осу"  => "https://github.com/ppy/osu",
-                _      => default(Optional<string>)
+                "осу" => "https://github.com/ppy/osu",
+                _ => default(Optional<string>)
             });
         return Task.FromResult(Result.FromSuccess());
     }