Adds basic enemy movement & Player castles

[Erikos66]

And SO it begins, added basics here, follow up video of progress so far below.

2025-02-09.03-27-23.mp4

This pull request includes several changes related to materials, prefabs, and scripts in the Unity project. The most important changes include the addition of new materials and prefabs, the renaming of certain files, and the introduction of new scripts for enemy movement and management.

Materials:

• Updated Assets/Materials/Emission_orange.mat to add _AddPrecomputedVelocity and modify _EmissionColor values. [1] [2]
• Updated Assets/Materials/Emission_red.mat to add _AddPrecomputedVelocity and modify _EmissionColor values. [1] [2]

Prefabs:

• Added new prefab Assets/Prefabs/Enemy_Portal.prefab with multiple components including GameObject, Transform, MeshFilter, MeshRenderer, and MonoBehaviour.
• Renamed Assets/Thirdparty/Ciathyza/Gridbox Prototype Materials.meta to Assets/Prefabs.meta.

Scripts:

• Added EnemyGroundMovement.cs script to control the movement of ground-type enemies along a path of waypoints.
• Added EnemyManager.cs script to manage enemy spawning with a respawn point and spawn timer.
• Added WaypointManager.cs script to manage waypoints for enemy navigation, including finding, sorting, and hiding waypoints.