* Added the official values for the AG_GOAL_ACHIEVE.
* Refactored the leveling logic for Achievements to account for the new values.
* Moved achievement EXP to a database file.
* Added AchievementLevel player variable to allow for easy tracking in the achievement condition checks.
* Cleaned up player GUI EXP progression.
* Added a check to not save achievements that made no changes.
* Added first login achievement.
Thanks to @Lemongrass3110!
* Alphabetically sorted includes.
* Updated copyright and license text to match across all files.
* Removed pragma once define in header files in lieu of ifdef guards.
