epm repack.d/generic-appimage.sh: set PRODUCTCUR (as lowercased PRODUCT) and create link if they differs

- epm play: add mailspring
- epm-remove: stop hi level removing when --noscripts is used
- epm play telegram: add check for glibc 2.28
- epm play: add sidequest
- epm play: add element-desktop
- epm play: add mattermost-desktop
- epm-assure: keep installed packages
- epm-autoremove: stop on AstraLinux (unsupported by the distro)
- epm: allow scripts in Kaspersky packages
- epm repack PacketTracker: improved for 8.2 and 8.2.1
- epm play packet-tracer: add install from sysnettechsolutions
- epm play: add epson-printer-utility
- epm-repack-rpm: use fakeroot when is not root (to avoid alien warning about root)
- vdhcoapp: fix package name
- eget: hide missed Brave's ipfs error
- eget: add support for a new IPFS gateways
- epm play: add nwjs-ffmpeg-prebuilt
- epm repack trueconf: fix for trueconf client since 8.4.0.1957