Update demos for Godot 4.4

- Resave all files with Godot 4.4 to make use of script/shader UIDs.
- Use AgX tonemapping in all demos that used a tonemapper other than Linear.

loading/threads/project.godot

@@ -14,7 +14,7 @@ config/name="Loading in a Thread"
 config/description="An example using a thread to load an image."
 config/tags=PackedStringArray("best_practices", "demo", "official", "performance")
 run/main_scene="res://thread.tscn"
-config/features=PackedStringArray("4.2")
+config/features=PackedStringArray("4.4")
 run/low_processor_mode=true
 config/icon="res://icon.webp"
 run/stretch/aspect="expand"

loading/threads/thread.gd.uid

@@ -0,0 +1 @@
+uid://chmblcpy328ih

loading/threads/thread.tscn

@@ -1,6 +1,6 @@
 [gd_scene load_steps=2 format=3 uid="uid://df1dmjx4ny0gd"]
 
-[ext_resource type="Script" path="res://thread.gd" id="1"]
+[ext_resource type="Script" uid="uid://chmblcpy328ih" path="res://thread.gd" id="1"]
 
 [node name="Thread" type="Control"]
 layout_mode = 3