add iq capture commands for gqrx#371

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mhassell wants to merge 3 commits intocsete:masterfrom

mhassell:mh-dev

Commits on Jan 22, 2025

first commit to add IQ capture
mhassell
committed

Commits on Jan 23, 2025

checked that AOIQ/LOIQ interfaces well with GQRX
mhassell
committed

Commits on Feb 8, 2025

adjusted commands to account for changes in gqrx
mhassell
committed