dsda: secret report option

disabled to be closer to vanilla on fresh boot, like most other modern features

src/BizHawk.Emulation.Cores/Computers/Doom/DSDA.ISettable.cs

@@ -147,6 +147,11 @@ namespace BizHawk.Emulation.Cores.Computers.Doom
 			[TypeConverter(typeof(ConstrainedIntConverter))]
 			public int DisplayPlayer { get; set; }
 			
+			[DisplayName("Report Revealed Secrets")]
+			[Description("Shows an on-screen notification when revealing a secret.")]
+			[DefaultValue(false)]
+			public bool ReportSecrets { get; set; }
+			
 			[DisplayName("HUD Mode")]
 			[Description("Sets heads-up display mode.")]
 			[DefaultValue(HudMode.Vanilla)]

src/BizHawk.Emulation.Cores/Computers/Doom/DSDA.cs

@@ -99,6 +99,7 @@ namespace BizHawk.Emulation.Cores.Computers.Doom
 				+ $"map_totals {(_settings.MapTotals ? 1 : 0)}\n"
 				+ $"map_time {(_settings.MapTime ? 1 : 0)}\n"
 				+ $"map_coordinates {(_settings.MapCoordinates ? 1 : 0)}\n"
+				+ $"hudadd_secretarea {(_settings.ReportSecrets ? 1 : 0)}\n"
 				+ "render_stretchsky 0\n"
 				+ "render_doom_lightmaps 1\n"
 				+ "render_aspect 3\n" // 4:3, controls FOV on higher resolutions (see SetRatio())