Allow FW position feedback override for FWs that don't report out current position

With reference to SBIG CFW8 doesn't report current filter would it be possible to have an option to not require the filter wheel to readout the current position (and assume that it is where it was last sent once it has stopped moving)?

The old SBIG CFW8 FWs don’t report back their position - result is that SGP attempts to re-move the FW each frame; if autofocus options are set appropriately, it then attempts to refocus after each frame thinking the FW has changed (!); it also doesn’t use the correct AF exposures for each filter (falls back to the OSC setting).

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