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.

popups/about_popup.gd

@@ -0,0 +1,59 @@
+class_name AboutPopup
+extends BasePopup
+## Shows the game version and what is new in each version.
+
+## What is new in each version, newest first.
+const WHATS_NEW: Dictionary = {
+	"1.9.0": "Made improvements to the Search window
+	Made small changes to the inspiration list scrolling
+	Made small changes to the player list
+	Changed the term game to soundtrack
+	#28: Made changes to the sync window
+	#34: Fixed bug in Character Select when clicking or scrolling",
+	"1.8.5": "#9: New winner screen with positions of all players
+	#32: New setting for how long to hide the beginning
+	#33: Fixed bug with hiding beginning when song restarts",
+	"1.8.0": "#14: Updated About page
+	#15: Create new keymap page
+	#20: The winner song can now be stopped
+	#24: The speed of the inspiration list can now be changed
+	#29: New settings to hide time left and things like that
+	#31: Added a QR page",
+	"1.7.0": "#22: Now block add player if player name is empty
+	#23: Add a log for when points are given to players
+	#25: Fixed some graphical stuff
+	#26: Changed so the same character can be on a song multiple times
+	#27: Turning off statistics after win",
+	"1.6.1": "#17: Removed Debug text in release
+	#18: Fixed bug with new character select screen",
+	"1.6.0": "#1: Fixed bug with inspiration list not reloading after sync
+	#2: New dialog for sync
+	#4: Now downloads characters from the server
+	#5: New character select screen
+	#6: Now show progress during sync
+	#7: Blocking all requests to the server during sync
+	#8: Added functionality to cache more than one song",
+	"1.5.0": "Made big changes to players and the song list and how the local song list works",
+	"0.9.0-Beta": "Fixed settings and updated the player view",
+	"0.8.0-Beta": "Fixed reset buttons and some other small things",
+	"0.7.8-Beta": "Added shortcuts. Added dialog for winner. Started cleaning code.",
+	"0.7.5-Beta": "Added settings menu, most things don't do anything yet",
+	"0.7-Beta": "Can now hop between songs"
+}
+
+@onready var about_panel: Panel = %AboutPanel
+@onready var version_label: Label = %VersionLabel
+@onready var whats_new_label: Label = %WhatsNewLabel
+
+
+func open() -> void:
+	super()
+	version_label.text = Settings.version
+
+	# Build changelog text with version headers
+	var changelog_text: String = ""
+	for version: String in WHATS_NEW.keys():
+		changelog_text += "\n" + version + "\n"
+		changelog_text += WHATS_NEW[version] + "\n"
+
+	whats_new_label.text = changelog_text