Adds 'save' shortcut to settings screens
closes #4414
- adds `ctrl/cmd+s` shortcuts to `settings/general` screen
- adds `ctrl/cmd+s` shortcuts to `settings/user/xx` screen
- extracts `ctrlOrCmd` variable to separate module for reuse
Merge pull request #4438 from Gargol/4414

Adds 'save' shortcut to settings screens