Added stuff from TNN2 Hoggit Core to lib

lib/error_handling.lua

@@ -0,0 +1,15 @@
+HandleError = function(err)
+    log("Error in pcall: "  .. err)
+    log(debug.traceback())
+    return err
+end
+  
+try = function(func, catch)
+    return function()
+      local r, e = xpcall(func, HandleError)
+      if not r then
+        return catch(e)
+      end
+      return r
+    end
+end