Added stuff from TNN2 Hoggit Core to lib

lib/utils.lua

@@ -0,0 +1,17 @@
+HOGGIT.filterTable = function(t, filter)
+    local out = {}
+    for k,v in pairs(t) do
+      if filter(v) then out[k] = v end
+    end
+    return out
+end
+  
+HOGGIT.listContains = function(list, elem)
+    for _, value in ipairs(list) do
+      if value == elem then
+          return true
+      end
+    end
+  
+    return false
+end