Last Changes before Section 4

[Erikos66]

This pull request to Assets/Scripts/Managers/EnemyManager.cs introduces a new system for managing enemy waves, allowing for more dynamic and varied enemy spawns. The changes include the introduction of a WaveDetails class to specify the number of different types of enemies, and several updates to the EnemyManager class to utilize this new system.

Enhancements to enemy wave management:

• Added WaveDetails class to specify the number of basic and fast enemies to spawn.
• Updated EnemyManager to use WaveDetails for controlling enemy spawns, including new serialized fields for enemy prefabs and respawn position.
• Implemented Start method to initialize the list of enemies to create at the beginning of the game.
• Modified Update method to check if there are enemies to create before spawning a new enemy and reset the spawn timer after spawning.
• Added GetRandomEnemy and NewEnemyWave methods to manage the list of enemies to spawn and to select a random enemy from the list.