KDE ISO Image Writer beta 0.9.2

https://download.kde.org/unstable/isoimagewriter/0.9.2/

73a7079c654a3cec3f7065e5296b1ce34ff565b894247fc7f9799f7c4d0c41c5 isoimagewriter-0.9.2.tar.xz



Windows builds are back

- update ubuntu and arch key
- open ISO from current directory
- claim freebsd support
- ifdef linux only code
- add back in Windows support
- Verify ISO with async API

Release notes:

Ubuntu and Arch ISOs appear not to be verified by gpgme library AppImage, Flatpak and Microsoft Store packaging needs doing (Snap in progress)
More testing on Windows would be good, also BSD and indeed all Linuxes