v1.8.9-20230420

This release removes 2020C mode in addition to the following content since the previous 1.8.9 test build:

1. Enhancements:
   • Adds option to show times in callsign list in UTC instead of local time. (See PR #362 and previous v1.8.9 test builds for info on the callsign list feature.)
   • Add Record button to the main window to easily allow recording of the incoming signal. (PR #369)
2. Bugfixes:
   • Fix crash on Windows after resizing the window to hide the waterfall. (PR #366)
   • Fix issue preventing Yaesu sound devices from appearing in Easy Setup. (PR #371)
3. Cleanup:
   • Remove 'Split' button from UI. (PR #372)
   • Remove dead code for RX/TX loopback buttons. (PR #372)

List of binary builds provided for this release:

• FreeDV-1.8.9-devel-2023-04-20-c6cad6e-windows-i686.exe (32 bit Windows for Intel/AMD)
• FreeDV-1.8.9-devel-2023-04-20-c6cad6e-windows-x86_64.exe (64 bit Windows for Intel/AMD, recommended for most Windows PCs)
• FreeDV-1.8.9-devel-2023-04-20-c6cad6e-windows-armv7.exe (32 bit Windows for ARM)
• FreeDV-1.8.9-devel-2023-04-20-c6cad6e-windows-aarch64.exe (64 bit Windows for ARM)
• FreeDV.dmg (Intel/ARM universal binary for macOS)