Adds bushes and flowers to ground tiles

Implements bush and flower spawning on ground tiles based on vegetation density.
Adds new assets for bushes and flowers, and introduces multi-mesh rendering for optimized performance.
Introduces seasonal color variations for vegetation using a shader for bushes and materials for flowers and grass.
Refactors material application into a MaterialManager to handle material assignments over multiple frames.
Moves ground tile scripts into a subfolder.
Adds floating particles to test scene.

Entities/Tree/assets/temp/flower_purpleB.glb.import

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Entities/Tree/assets/temp/plant_bush.glb.import

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Entities/Tree/scripts/color_default.gd

@@ -104,5 +104,5 @@ func update_material_in_mesh_instance(mesh_instance: MeshInstance3D, material_na
 
 
 func apply_material_with_queue(mesh_instance: MeshInstance3D, index: int, material: StandardMaterial3D):
-	ColorData.queue_material_application(mesh_instance, index, material)
+	MaterialManager.queue_material_application(mesh_instance, index, material)
 	return

Entities/Tree/scripts/tree.gd

@@ -33,7 +33,7 @@ func spawn_model():
 	
 	# Instantiate the model from the TreeDataResource
 	model_instance = tree_data.model.instantiate()
-	tree_data.apply_seasonal_colors(model_instance, "spring")
+	tree_data.apply_seasonal_colors(model_instance, Season.current)
 	add_child(model_instance)