* Added scan_length to AddressableScanEffect (allow more than one LED) * Added check for scan length being longer than addressable light * Added config option 'scan_length' to AddressableScanEffect (default: 1) * Renamed scan_length to scan_width, removed erroneous length check * Fixed indentation issue in addressable_light_effect.h Co-Authored-By: Otto Winter <otto@otto-winter.com>