Add support for public list of SDRangel servers that can be displayed on Map.
Add FLAC and zlib IQ compression.
Add IQ squelch for compression.
Add remote device/antenna position and direction reporting.
Add text messaging.
Most plugins that use reverse API to PATCH settings updates to remote
server only do so when `useReverseAPI` is toggled, but not when the
relevant settings are being updated. So lets fix the precondition to
use the `m_useReverseAPI` flag instead.