OpenEMS/openems: 2021.12.0

Highlights Export Channels to Excel (#1526) This very helpful new feature adds a link in UI Profile to download an Excel file with all Channels and their current value. Also adds information about the 'source' of a Channel, e.g. the modbus register address. See #1526 for details Bug Fixes and Other Changes UI: Flatwidget for selfconsumption (#1475) Backports from FENECON FEMS 4788e0593fd0ccf4223dfa996d33773932cb77cc ease implementation of @Modified with ModbusComponents improve Channels concurrency in AbstractOpenemsComponent improve error log message on updateReferenceFilter improve error log message in websocket OnNotification improve exception handling in websocket OnRequest improve exception handling in Rest-API handler Soltaro Single Rack battery: downgrade fault to warning TypeUtils: add fitWithin() and abs() methods ESS Fix Active Power Controller: apply new set-point faster using @Modified 77f872e9c97a042c77ecebf20e6f9cfd8bbce4ff Check duplicated Modbus Register to Channel mappings (#1543) This automatically checks and throws an error if there are multiple Modbus registers mapped to the same Channel Bump postgresql from 42.2.21 to 42.2.22 in /cnf (#1538) UI: drop deprecated angular2-uuid bf7d67da30ba55de9b5668cda6b021780de367d