Urh

This release fixes the following issues:

- [330](https://github.com/jopohl/urh/pull/330) - Improve modulation for large protocols
- [329](https://github.com/jopohl/urh/pull/329) - Improve handling of protocol files
- [324](https://github.com/jopohl/urh/issues/324) - LimeSDR: Failed to receive stream
- [297](https://github.com/jopohl/urh/issues/297) - LimeSDR RX antenna always LNA_L

This release fixes two crashes as described in 327.

This release fixes 323 .

This is a hotfix release that fixes native device extensions on Windows when conflicting SDR software is installed.
Furthermore, a health check button for native device extensions was added to options.

Details can be found in this PR: 321

This release adds two highly demanded features to URH: __Spectrogram View__ and __Channel Separation__. Learn more about them in the [wiki](https://github.com/jopohl/urh/wiki/Spectrogram) and keep hacking like a boss!

This release adds installers for Windows. If you use the new installer and should get an error about missing api-ms-win-crt-runtime-l1-1-0.dll , run Windows Update or directly install [KB2999226](https://support.microsoft.com/en-us/help/2999226/update-for-universal-c-runtime-in-windows).
__It is recommended to use the 64 bit version (amd64) of URH on Windows__, because 32 bit version has no native device support.

This release also fixes some bugs:

- Fix exhaustive fuzzing mode
- Fix a rare crash in Generator tab when performing undo
- fix checksum assignment to fuzzed messages when sending/generating data
- refresh estimated time in generator if pause was edited