New RTTY and PSK31 modulators

New RTTY and PSK31 modulators

We have added two new channel modulators thanks to @srcejon

• RTTY (PR #1800): https://github.com/f4exb/sdrangel/tree/master/plugins/channeltx/modrtty
• PSK31 (PR #1814): https://github.com/f4exb/sdrangel/tree/master/plugins/channeltx/modpsk31

Other changes and fixes

• Flush log stream after write, so data is available immediately. PR #1834. Fixes #1833 from @srcejon
• Remote TCP improvements. PR #1830. Fixes #1827 from @srcejon
• Fix ffpmeg/opencv dependencies. Enable C lang on Mac, for external project. PR #1828. Fixes #1819 from @srcejon
• Request authorization for access to camera and microphone on Mac. PR #1824. Fixes #1819 from @srcejon
• Fixed Swagger files generation and added missing files. Fixes #1821
• Add strings describing why Microphone, Camera and Location are required on MacOS. PR #1822. Fixes #1819 from @srcejon
• Add windows-default preset for building with Visual Studio. PR #1816 from @srcejon
• Add Android SDR Driver sample source. PR #1815 from @srcejon
• Distingush between China and Taiwan. PR #1810. Fixes #1805 from @srcejon
• Add command line options to start Remote TCP Sink on a specified device/ PR #1809. from @srcejon

Binary artifacts

For more details on artifacts and their contents please read the quick start in the Wiki.
Note that Ubuntu .deb package is for 22.04. Please note that SSE 4.2 is required.