generate event improvements

[loordgek]

when you select RegistryEvent.Register you get

@SubscribeEvent
public void onRegistryRegister(RegistryEvent.Register event) {}

but it should be

@SubscribeEvent
        public void onRegistryRegister(RegistryEvent.Register<things that implement IForgeRegistryEntry> event) {}

it would be useful if we can select multiple events to generate .
some events have multiple inner events like PRE and POST
if you do not use a inner event a a warring needs to be shown

[loordgek]

when using 2 onRegistryRegister methods in a class that will error
name it somthing like"on(things that implement IForgeRegistryEntry)Register"
like onItemRegister onBlockRegister onIRecipeRegister etc