Move the TraitInfo stuff into rules.lua

mods/common/lua/rules.lua

@@ -0,0 +1,21 @@
+Rules = { }
+
+Rules.HasTraitInfo = function(actorType, className)
+	return Internal.HasTraitInfo(actorType, className)
+end
+
+Rules.TraitInfoOrDefault = function(actorType, className)
+	return Internal.TraitInfoOrDefault(actorType, className)
+end
+
+Rules.TraitInfo = function(actorType, className)
+	return Internal.TraitInfo(actorType, className)
+end
+
+Rules.InitialAltitude = function(actorType)
+	local ai = Rules.TraitInfoOrDefault(actorType, "AircraftInfo")
+	if ai ~= nil then
+		return ai.CruiseAltitude
+	end
+	return 0
+end