Improve updater behavior
In case of Delayed updates or Update approval needed mode:
- Remove ignore button from Updates page and from UpdatesDropdown
- Add approximate time until the update is not installed
- Notify users about the Update approval needed option
- Restructure Updates page & add delayed information
- Lift Updates up above Update Settings in the sidebar
- Other small improvements
It closes #262 (closed), #195 (closed).
Edited by Aleksandr Gumroian