- prescription/chromium-gost.sh: fix removing
- serv: use systemd by default for any system
- chromium-gost-stable.sh: drop obsoleted menu file
- epm play: add yandex-browser, improve repacking
- epm play: add spotify install support
- epm play: add tamtam messenger install support
- distr_info: use /etc/os-release firstly, drop obsoleted code
- distr_info: set rolling version for ArchLinux