Add short-hand group aliases

PluralKit.Bot/Commands/MemberCommands.cs

@@ -12,6 +12,7 @@ using Image = SixLabors.ImageSharp.Image;
 namespace PluralKit.Bot.Commands
 {
     [Group("member")]
+    [Alias("m")]
     public class MemberCommands : ContextParameterModuleBase<PKMember>
     {
         public SystemStore Systems { get; set; }

PluralKit.Bot/Commands/SwitchCommands.cs

@@ -10,6 +10,7 @@ using NodaTime.TimeZones;
 namespace PluralKit.Bot.Commands
 {
     [Group("switch")]
+    [Alias("sw")]
     public class SwitchCommands: ModuleBase<PKCommandContext>
     {
         public SystemStore Systems { get; set; }

PluralKit.Bot/Commands/SystemCommands.cs

@@ -14,6 +14,7 @@ using PluralKit.Core;
 namespace PluralKit.Bot.Commands
 {
     [Group("system")]
+    [Alias("s")]
     public class SystemCommands : ContextParameterModuleBase<PKSystem>
     {
         public override string Prefix => "system";