LoadEnemyConfigs loads enemy configs from the Enemies directory.

LoadLevelConfigs loads level configs from the Levels directory.

LoadMapConfigs loads map configs from the Maps directory.

LoadReplays loads replays from the Replays directory.

LoadTowerConfigs loads tower configs from the Towers directory.

LoadUIConfig loads UI configs from the UI directory.

ReadConfigs reads all files with extension ext from dirName and returns a slice of T.

ErrUINotOnce is returned when there are more than 1 files in ./UI.