M17 support in Windows

M17 support in Windows

Thanks to @Paulo-D2000 issues with compiling M17 library code was fixed and thus we now have M17 modulator and demodulator available in the Windows release. PR 1404

Other changes and fixes

• Use grey text for disabled widgets. PR 1402 by @srcejon
• Stack workspace: Use full width for spectrum when no channels. PR 1403 by @srcejon
• Fix c++17 compilation with MSVC. PR 1405 by @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 20.04. Please note that SSE 4.2 is required.