New device support:
- Eurom Mon Soleil 601 heater (issue #73)
- Nedis HTPL20F heater (issue #74)
- Eurom SaniWall 2000 heater (issue #75)
New feature:
- ability for temperature range to be specified by dps rather than fixed in the config (for issue #76, still in progress)
Changes to existing functionality:
- remove deprecated legacy_class feature and the two remaining device specific classes
- add icons to a number of secondary entities that were added in 0.13.1
- added overcharge cutoff control switch to Advanced Energy monitoring smartswitch (issue #72)