Allow setting IgnoreExtraArgs on an individual basis (#998)

* Allow setting IgnoreExtraArgs on an individual basis

* Remove passing in the flag as a separate parameter

* VS plz

* Push the RunMode setting out to its own attribute, because fox wants consistency.

Bonus: Removes the need for that godawful 'RunMode.Default'.

* Revert previous commit

* Fox doesn't like module-wide switches 😒

src/Discord.Net.Commands/Builders/ModuleClassBuilder.cs

@@ -158,6 +158,7 @@ namespace Discord.Commands
                         builder.AddAliases(command.Text);
                         builder.RunMode = command.RunMode;
                         builder.Name = builder.Name ?? command.Text;
+                        builder.IgnoreExtraArgs = command.IgnoreExtraArgs ?? service._ignoreExtraArgs;
                         break;
                     case NameAttribute name:
                         builder.Name = name.Text;