Log through a GameLog autoload instead of print()

GameLog.debug() prints only in debug builds, and GameLog.warning() reports
problems such as unexpected server data or failed downloads.

Player.gd

@@ -61,7 +61,7 @@ func change_character() -> void:
 	change_character_clicked.emit()
 
 func new_character_selected(character_texture: ImageTexture) -> void:
-	print("Back in player list with new")
+	GameLog.debug("Back in player list with new")
 	player_object.character = character_texture
 	set_player_character()