Add scenes, static scene-finding mechanism, and scene pool for visual hold/tap notes.

rhythm_game/note/visual/note_scenes.gd

@@ -0,0 +1,26 @@
+## Static class that stores references to note scenes.
+class_name NoteScenes extends Object
+
+static func get_tap(skin: StringName = "default") -> PackedScene:
+	if _tap_scenes.has(skin):
+		return _tap_scenes[skin]
+	else:
+		push_warning("Tap note skin [", skin, "] does not exist.")
+		return _tap_scenes["default"]
+
+static func get_hold(skin: StringName = "default") -> PackedScene:
+	if _hold_scenes.has(skin):
+		return _hold_scenes[skin]
+	else:
+		push_warning("Hold note skin [", skin, "] does not exist.")
+		return _hold_scenes["default"]
+
+# ======== IMPLEMENTATION ======== #
+
+static var _tap_scenes: Dictionary[StringName, PackedScene] = {
+	"default": load("uid://dq5ocf0272tet")
+}
+
+static var _hold_scenes: Dictionary[StringName, PackedScene] = {
+	"default": load("uid://jbgxbhfpj806")
+}