developpement d'écran de chargement et d'écran de sélection de niveau

* modification de certains assets
* optimisation de chunks
* ajout d'un SceneManager
* ajout d'un premier dialogue avec Demeter
* changement des jour en charge
* mise en place d'un système de run
* etc...

gui/loading_screen/scripts/loading_screen.gd

@@ -0,0 +1,32 @@
+extends CanvasLayer
+
+const LOADING_BAR_UPDATE_TIME := 0.2
+
+var loading_value = 0.
+var loading_text = "" : 
+    set(v):
+        %LoadingText.text = v
+        loading_text = v
+
+func _ready():
+    %LoadingInterface.visible = false
+
+func show_loading_screen(animation := true):
+    %LoadingProgressBar.value = 0.
+    if animation:
+        await %LoadingAnimation.fade_in()
+    else :
+        %LoadingInterface.visible = true
+
+func hide_loading_screen(animation := true):
+    if animation and is_node_ready():
+        if %LoadingAnimation.on_animation:
+            await %LoadingAnimation.animation_ended
+        await %LoadingAnimation.fade_out()
+    else : %LoadingInterface.visible = false
+    loading_value = 0.
+    %LoadingProgressBar.value = 0
+
+func _process(_d):
+    if %LoadingInterface.visible:
+        %LoadingProgressBar.value = lerp(%LoadingProgressBar.value, loading_value * 100, 0.1)