Contribution with extended functionality - updates save_vsr_300 file

[cbjornerud]

Changes made 2023-12-29

added sensors for fan speed at all levels

added control of normal fan speed, supply and exhaust individually

added unique ID to all entities: switches, inputs, helpers and sensors

Unique ID enables adding the entities to one or more areas.

save_vsr_300_textformat.txt

[Ztaeyn]

Thank you good sir! I've incorporated these along with a glass of wine :)