Cobblemon Spawn Alerts

-Added new dynamic replacements: {name}, {level}, {ivs}, {nature}, and {coords}
-Changed default_spawn_message.txt to message_templates.json. The fullSpawnMessage template is only used if a custom spawn message is not provided. The others can be used in custom spawn messages via dynamic replacement, or as the default when a custom spawn message isn't provided.
-Added level, ivs, nature, and coordinates as hoverable messages that can be enabled via showInfoAsHover in the Pokemon's config.