Added Mine & Caverns raise & lower functionality

Added Mine & Caverns raise & lower functionality.  Revamped Level 1 events to match PnP.  Updated Level 1: Core.  Added new Footcatcher trap type. Added Underwater heartbeat to Glop Lake Underwater.  Full compile.

_module/nss/cavein_retex.nss

@@ -0,0 +1,51 @@
+void main()
+{
+//:: Get the placeable object that triggers the script.
+    object oPlaceable = OBJECT_SELF;
+	
+	string sTexture;
+
+//:: Check if a custom local variable has been set to indicate that the script has run.
+    int bHasRun = GetLocalInt(oPlaceable, "HasRun");
+
+    if (!bHasRun)
+    {
+		switch (d4(1))
+		{
+			case 1:
+			{ 
+				sTexture = "tdm01_rock01";
+				break;
+			}
+			
+			case 2:
+			{ 
+				sTexture = "tdm01_rock02"; 
+				break;
+			}
+			
+			case 3:
+			{ 
+				sTexture = "tdm01_rock03";
+				break;
+			}	
+
+			case 4:
+			{ 
+				sTexture = "tdm01_rock04";
+				break;
+			}				
+		
+		}		
+			
+		ReplaceObjectTexture(oPlaceable, "tx_rough_006g", sTexture);
+
+	//:: Set the local variable to indicate that the script has run.
+        SetLocalInt(oPlaceable, "HasRun", 1);
+		
+	//:: Removed HB script from event to save resources
+		SetEventScript(oPlaceable, EVENT_SCRIPT_PLACEABLE_ON_HEARTBEAT, "");
+		
+    }
+}
+