Add Building Does Not Exist event

Author: Rampastring

src/TSMapEditor/Config/Default/Events.ini

@@ -557,4 +557,10 @@ Name=Local Less Than Local (Vinifera)
 Description=True if a local variable is less than another local variable.
 P1Type=-3
 P2Type=LocalVariable
-P3Type=LocalVariable
+P3Type=LocalVariable
+
+;80
+[BuildingDoesNotExist]
+Name=Building Does Not Exist
+Description=Triggers when the building specified (owned by the house of this trigger) does not exist.
+P2Type=Building

src/TSMapEditor/Constants.cs

@@ -4,7 +4,7 @@ namespace TSMapEditor
 {
     public static class Constants
     {
-        public const string ReleaseVersion = "1.8.0";
+        public const string ReleaseVersion = "1.8.1";
 
         public static int CellSizeX = 48;
         public static int CellSizeY = 24;