Upgrade to SDRPlay v3 & Fix build errors

[stevenjoezhang]

See jopohl/urh#1188

The installer at https://www.nuand.com/windows_installers/bladeRF-win-installer-2021.03.exe is no longer available, so I tried switching to a newer version; however, the versions provided on GitHub no longer support Windows x86.

In addition, python 3.8+ won't load dll from src/urh/dev/native/lib/shared/ directory, causing errors: (https://github.com/stevenjoezhang/sdrbuild/actions/runs/18632979312/job/53120282231)

AirSpy:    FAILURE (DLL load failed while importing airspy: The specified module could not be found.)
BladeRF:   FAILURE (No module named 'urh.dev.native.lib.bladerf')
HackRF:    FAILURE (DLL load failed while importing hackrf: The specified module could not be found.)
RTLSDR:    FAILURE (DLL load failed while importing rtlsdr: The specified module could not be found.)
LimeSDR:   FAILURE (DLL load failed while importing limesdr: The specified module could not be found.)
PlutoSDR:  FAILURE (DLL load failed while importing plutosdr: The specified module could not be found.)
SDRPlay:   FAILURE (No module named 'urh.dev.native.lib.sdrplay')
USRP:      FAILURE (DLL load failed while importing usrp: The specified module could not be found.)

I believe all other issues have been resolved.

[stevenjoezhang]

Python 3.7 is too old and it can't support the latest PyQt5. However, Python 3.8 and newer impose stricter restrictions on DLL loading. I haven't found the best solution yet.