Added documentation comments

        self.update_settings(self.settings_file.load())

        # Data cache

        # Sometimes, like when doing large scans, we don't need to read the hardware

        # state for every single capture. We can get the data once at the start,

        # cache it, and reuse that to save on IO. Cached data is stored here.

        self.configuration_cache = ExpiringDict(max_len=100, max_age_seconds=3600)

        self.metadata_cache = ExpiringDict(max_len=100, max_age_seconds=3600)