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.

character.gd

@@ -22,10 +22,11 @@ func set_character_name(character_name: String) -> void:
 		var img: Image = Image.new()
 		var err: Error = img.load_png_from_buffer(image)
 		if err != OK:
-			print(err)
+			GameLog.debug("Character image is not a PNG, trying JPG: ", error_string(err))
 			var err2: Error = img.load_jpg_from_buffer(image)
 			if err2 != OK:
-				print(err2)
+				GameLog.warning("Could not load the image for ", character_name, ": ",
+						error_string(err2))
 		var new_image: ImageTexture = ImageTexture.new()
 		new_image.set_image(img)
 		character_image.custom_minimum_size = Vector2(200, 100)
@@ -42,5 +43,5 @@ func _input(event: InputEvent) -> void:
 		if event is InputEventMouseButton && event.is_pressed() && event.get_button_index() == MOUSE_BUTTON_LEFT:
 			var evLocal: InputEvent = make_input_local(event)
 			if Rect2(Vector2(0, 0), panel.size).has_point(evLocal.position):
-				print(character_name_label.text)
+				GameLog.debug(character_name_label.text)
 				new_character_selected.emit(character_image.texture)