Implements procedural ground tile generation

Adds procedural ground tile generation with chunking for improved performance.

Includes:
- Ground tile entity with debug text and cell information
- Grass and tree placement based on cell data
- Ground shader for visual representation
- Chunk loading and unloading system based on player position

Entities/GroundTile/scripts/grass_multimesh.gd

@@ -0,0 +1,66 @@
+# GrassMultiMesh.gd (assuming this is your MultiMeshInstance3D script)
+extends MultiMeshInstance3D
+
+var mm: MultiMesh
+@onready var parent_node: GrassController
+
+func _ready() -> void:
+	# Use call_deferred to ensure proper initialization order
+	call_deferred("_setup_connections")
+
+func _setup_connections() -> void:
+	parent_node = get_parent() as GrassController
+	if parent_node == null:
+		Log.pr("Error: Parent node is not a GrassController!")
+		return
+	
+	parent_node.grass_data_ready.connect(_on_grass_data_ready)
+	Log.pr("Connected to grass_data_ready signal")
+
+func _on_grass_data_ready():
+	Log.pr("Received grass_data_ready signal, setting up multimesh")
+	setup_multimesh()
+
+func setup_multimesh() -> void:
+	if parent_node == null:
+		Log.pr("Error: Parent node not available in setup_multimesh")
+		return
+	
+	# Load the mesh resource directly
+	var mesh = load("res://Stages/Test3D/assets/stylizedGrassMeshes/grass2_mesh.res")
+	if mesh == null:
+		Log.pr("Error: Could not load grass mesh")
+		return
+	
+	# Create new MultiMesh instance
+	mm = MultiMesh.new()
+	
+	# Configure the MultiMesh
+	mm.transform_format = MultiMesh.TRANSFORM_3D
+	mm.instance_count = parent_node.grass_instance_range
+	mm.mesh = mesh
+	
+	Log.pr("Setting up MultiMesh with " + str(mm.instance_count) + " instances")
+	
+	# Generate random positions for grass
+	for i in range(mm.instance_count):
+		var random_pos = Vector3(
+			randf_range(-1.0, 1.0),
+			0.0,
+			randf_range(-1.0, 1.0)
+		)
+		
+		var random_rotation = randf_range(0.0, TAU)
+		var basis = Basis(Vector3.UP, random_rotation)
+		
+		var random_scale = randf_range(0.05, 0.3)
+		basis = basis.scaled(Vector3(random_scale, random_scale, random_scale))
+		
+		var tx = Transform3D(basis, random_pos)
+		mm.set_instance_transform(i, tx)
+	
+	# Assign the MultiMesh to this node
+	multimesh = mm
+	cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
+	
+	Log.pr("MultiMesh setup complete with " + str(multimesh.instance_count) + " instances")