Add metrics. Opt-out by removing the "metrics" line in the config file, or by setting "metrics" to "false". Users who installed a previous version are opted-out by default unless configuration file is regenerated.
Added bounds to configuration settings to mitigate invalid values.
Support custom lang files (Place in /plugins/DeepCaveSpiders/lang/)
Fix issue where normal spiders might not be replaced when spawnChance is set to 100% if Math.random() returns a 1.
