* Update switch-to-nvidia.sh

* исправлен вывод переменной USED_KFLAVOUR в терминал
* добавлена проверка на добавление аргументов в grub (исправляет дубляжи если запускать с аргументом force)
* бэкап конфига grub создается только при условии изменения в конфиге

- epm-sh-altlinux-contents-index: fix update content index
- epm repack plex-desktop: fix repack with eepm-rpm-build
- epm-search: don't use -- in dnf/yum search
- set_sudo: check sudo twice
- distr_info: use lastest ID_LIKE word
- distr_info: fix Android version detection
- epm play yandexmusic: update download package name
- repack.d/generic.sh: disable /usr/lib/.build-id generating
- epm repack google-chrome-stable: fix summary, add conflicts to google-chrome-preinstall
- repack.d/unigine-superposition.sh: stop require libQt5Test.so.5
- epm play: rename yandexmusic.sh to yandex-music.sh
- epm play: don't check if a play script is executable
- epm repack teamspeak3: add libwebp6 install (fix github issue 64)
- epm repack teamspeak3: remove unusable libqwayland*
- epm play teamspeak: update versions
- epm play: add singularityapp (fix github issue 49)
- epm requires: check every file separately
- epm repack singularityapp: remove common libs
- epm play: add vk-messenger (fix github issue 50)