Cobblemon Chat Alerts

Changes

• Fixed duplicate Pokedex alerts so only species-level progress upgrades generate a new-entry message.
• Prevented cancelled rare spawns from being announced.
• Removed the non-functional sub-legendary filter.
• Updated rarity checks to use Cobblemon's form-aware Pokemon helpers.
• Renamed "Whole world" to "Whole dimension".
• Clarified multiplayer and dedicated-server configuration requirements.
• Embedded the MIT license in both JAR files.
• Added automated tests for rarity filters, IV thresholds, and Pokedex progress transitions.
• Fixed a Gradle compatibility warning.