basic slide setup and theme

Update presentation_theme.tres, standard.tscn, footer.gd, and 1 more file

widgets/footer.gd

@@ -0,0 +1,18 @@
+@tool
+extends PanelContainer
+
+@export var text : String :
+	set(value):
+		text = value
+		text_label.text = text
+@export_group("Node References")
+@export var text_label : Label
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass