Big upstream updates - check main-2.6 for fixes

[benedekkupper]

There has been a large changeset published by the HIDSharp author: https://software.seekye.com/hidsharp - importantly there is now an upstream github repository maintained by the author himself: https://github.com/SeekHisKingdom/HIDSharp

1. Try main-2.6 to see if your long-standing issues are resolved.
2. Unresolved issues shall be reported directly upstream.