Sort the scripts and scenes into folders

main/ holds the main window and top bar, quiz/ the quiz and its parts,
player/ the music player, popups/ every popup and what they share, data/ the
songs, players, playlist and settings, server/ the MusicServer client,
common/ the list row and GameLog, and themes/ the themes and style boxes.

tests/integration/test_inspiration_list.gd

@@ -15,7 +15,7 @@ func before_test() -> void:
 	Settings.inspiration_list_speed = 0
 	_server = FakeHttpTransport.new().install()
 	_server.respond_json("/music/all", SOUNDTRACKS)
-	_runner = scene_runner("res://InspirationList.tscn")
+	_runner = scene_runner("res://quiz/InspirationList.tscn")
 	_list = _runner.scene()
 
 

tests/integration/test_layout_unchanged.gd

@@ -86,7 +86,7 @@ func before() -> void:
 	viewport.size = Vector2i(1920, 1080)
 	viewport.gui_embed_subwindows = true
 	Engine.get_main_loop().root.add_child(viewport)
-	_main = load("res://MainWindow.tscn").instantiate()
+	_main = load("res://main/MainWindow.tscn").instantiate()
 	viewport.add_child(_main)
 	await UiTour.new(_main).run(func(state: String, popup: Node) -> void:
 		_layout[state] = UiTour.dump_layout(_main, _main if popup == null else popup))

tests/integration/test_music_list_panel.gd

@@ -17,7 +17,7 @@ func before_test() -> void:
 		song.song_title = "Song %d" % i
 		song.has_played = true
 		Playlist.add_to_playlist(song)
-	_runner = scene_runner("res://MusicListPanel.tscn")
+	_runner = scene_runner("res://quiz/MusicListPanel.tscn")
 	_panel = _runner.scene()
 
 

tests/integration/test_music_player_scene.gd

@@ -9,7 +9,7 @@ var _player: MusicPlayer
 func before_test() -> void:
 	_snapshot = AutoloadSnapshot.take([Settings])
 	Settings.auto_repeat_song = true
-	_runner = scene_runner("res://MusicPlayer.tscn")
+	_runner = scene_runner("res://player/MusicPlayer.tscn")
 	_player = _runner.scene()
 
 

tests/integration/test_now_playing.gd

@@ -6,7 +6,7 @@ var _now_playing: NowPlaying
 
 
 func before_test() -> void:
-	_runner = scene_runner("res://NowPlaying.tscn")
+	_runner = scene_runner("res://quiz/NowPlaying.tscn")
 	_now_playing = _runner.scene()
 
 

tests/integration/test_players_panel.gd

@@ -11,7 +11,7 @@ func before_test() -> void:
 	_snapshot = AutoloadSnapshot.take([Settings])
 	Settings.player_array.clear()
 	Settings.edit_players = false
-	_runner = scene_runner("res://PlayersPanel.tscn")
+	_runner = scene_runner("res://quiz/PlayersPanel.tscn")
 	_panel = _runner.scene()
 
 

tests/integration/test_quiz_toolbar.gd

@@ -14,7 +14,7 @@ var _toolbar: QuizToolbar
 
 
 func before_test() -> void:
-	_runner = scene_runner("res://QuizToolbar.tscn")
+	_runner = scene_runner("res://quiz/QuizToolbar.tscn")
 	_toolbar = _runner.scene()
 
 

tests/integration/test_scene_split.gd

@@ -9,6 +9,17 @@ const MAIN_WINDOW_CHILDREN: Array[String] = [
 	"ShortcutsPopup", "StatisticsPopupPanel", "AboutPopup", "LogPopup",
 ]
 
+## The parts of the quiz and the scene each one comes from.
+const QUIZ_PART_SCENES: Dictionary = {
+	"MusicListPanel": "res://quiz/MusicListPanel.tscn",
+	"PlayersPanel": "res://quiz/PlayersPanel.tscn",
+	"InspirationList": "res://quiz/InspirationList.tscn",
+	"NowPlaying": "res://quiz/NowPlaying.tscn",
+	"QuizToolbar": "res://quiz/QuizToolbar.tscn",
+	"SongControls": "res://quiz/SongControls.tscn",
+	"MusicPlayer": "res://player/MusicPlayer.tscn",
+}
+
 ## The quiz buttons that are disabled while the server syncs.
 const LOCKED_BY_SYNC: Array[String] = [
 	"QuizToolbar/SoundTestButton", "QuizToolbar/ResetPlaylistButton",
@@ -57,10 +68,9 @@ func test_top_bar_is_drawn_below_the_quiz() -> void:
 
 
 func test_quiz_parts_are_their_own_scenes() -> void:
-	for node_name: String in ["MusicListPanel", "PlayersPanel", "InspirationList",
-			"NowPlaying", "QuizToolbar", "SongControls", "MusicPlayer"]:
+	for node_name: String in QUIZ_PART_SCENES:
 		assert_str(_quiz.get_node(node_name).scene_file_path) \
-				.is_equal("res://%s.tscn" % node_name)
+				.is_equal(QUIZ_PART_SCENES[node_name])
 
 
 func test_quiz_downloads_songs_with_a_song_loader() -> void:

tests/integration/test_song_controls.gd

@@ -7,7 +7,7 @@ var _controls: SongControls
 
 
 func before_test() -> void:
-	_runner = scene_runner("res://SongControls.tscn")
+	_runner = scene_runner("res://quiz/SongControls.tscn")
 	_controls = _runner.scene()
 
 

tests/integration/test_sync_popup.gd

@@ -12,7 +12,7 @@ func before_test() -> void:
 	Settings.currently_syncing = false
 	_server = FakeHttpTransport.new().install()
 	_server.respond_bytes("/sync", PackedByteArray())
-	_runner = scene_runner("res://SyncPopup.tscn")
+	_runner = scene_runner("res://popups/SyncPopup.tscn")
 	_window = _runner.scene()