Sleipnir Browser

What's new in this version:

Big changes:
- Python 3.5 and above are the only supported versions of Python
- Cache handling is greatly improved, resulting in more stable speeds on some systems
- Articles failing with CRC errors are now retried on other servers
- SFV files, even obfuscated, will be used for renaming when there are no par2 files
- Fully obfuscated RAR-sets with no verification files are detected and extracted
- Built-in internet bandwidth test
- Windows Service support was changed. The service will need to be reinstalled
- The Windows installer is 64-bit only, for 32-bit please use the standalone package

Other changes:
- Files inside an NZB that are fully identical are now skipped automatically
- Folders of jobs that failed post-processing are renamed to _FAILED_
- Blocking of unwanted extensions that are directly inside an NZB
- In Python 3 OpenSSL 1.1.1 is used for Windows and macOS, as a resul
- newsservers manually set to RC4-MD5 cipher can no longer connect
- TLS1.3 support for newsserver connections
- SABYenc, par2 and unrar are now required to start downloading
- Growl-support was removed
- The smpl skin was removed
- Using the API with output=text to add NZB's will report the nzo_ids instead of ok
- Queue-item labels are no longer part of the name but separated in API-property labels
- API-calls tapi and qstatus were removed
- On Windows only Multipar is available for repair
- Linux tray icon support was improved
- On Linux special permission bits are removed from files after download
- macOS features such as the menu and notifications now use native code

Bug-fixes:
- Resolved potential security issue in FAT-filesystem check and Nice and IONice Parameters
- More information: GHSA-9x87-96gg-33w2
- Sample removal did not work if only 1 sample file was present
- Crash on badly formatted RSS-feeds or readout during editing
- Only really run pre-queue-script when it is set
- Always report API paused status as a boolean
- Automatic aborting of jobs that can't be completed would sometimes not trigger
- Windows systems could enter standby state during downloading
- Some errors thrown by unrar were not caught
- Files and sockets were not always closed correctly
- Unwanted extension check was overly aggressively deleting folders