add invert: true (for domain cover)

[Mariusthvdb]

Plase consider adding an option invert: true. Covers have 100% position when fully opened, while logic would seem to dictate the position would be added to the % of being covers being closed....

see this for the position in HA now, on a fully opened cover:

while the Ikea app shows it like this:

the latter feels better imho, and reflects the way on/off for a light or switch would compare to open/closed for a cover.

A simple inversion might could solve this?

thanks for considering

[thomasloven]

See #64 and #75 and #134.

[Mariusthvdb]

pardon me, missed those... really sorry

[thomasloven]

No worries.