Cobblemon Trainer Battle

• Added trainer configuration options: balance, commands
• Added trainer battle conditions: maximumPartyLevel, minimumPartyLevel
• Removed radicalred, inclementemerald, custom subcommands
• Trainers are directly specified instead

Fixed bug failing to load the mod when invalid trainer files are provided

• Added Inclement Emerald trainers
• Updated README.md
• Added custom trainer feature
• Added a bit more polished Battle Frontier mini-game
• Added configuration file
• Added support for OctoEconomyApi
• Added Generation5AI from CobblemonTrainers by selfdot