Debug: Insivible

[kphoenix137]

Adds invisibility to debug options to avoid dealing with annoying monsters while trying to test things.

[StephenCWills]

This is useful, but here's how I usually do it.

diff --git a/Source/diablo.cpp b/Source/diablo.cpp
index 7615268c7..cc3d7c2ab 100644
--- a/Source/diablo.cpp
+++ b/Source/diablo.cpp
@@ -1440,7 +1440,8 @@ void GameLogic()
 	}
 	if (leveltype != DTYPE_TOWN) {
 		gGameLogicStep = GameLogicStep::ProcessMonsters;
-		ProcessMonsters();
+		if (DebugToggle)
+			ProcessMonsters();
 		gGameLogicStep = GameLogicStep::ProcessObjects;
 		ProcessObjects();
 		gGameLogicStep = GameLogicStep::ProcessMissiles;