Move all database and config files from the main bot directory to a separate path in system files

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Also make a migration assistant into the bot, to migrate any existing database/config files from their old location to new location

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Update

This will be done in three steps:

1. For all config files (after PR referencing Run request-based updates for some config files while starting up the bot #401 is complete)
2. For all database files
3. Making and testing the data migration assistant

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Complete!

Status:

1 and 2. #405
3. https://github.com/PyBotDevs/isobot-data-migration-assistant