Changes:
1. Make PermissionsView/EditPermissionsView configurable to support channel permissions config
2. Adding channel permissions support in the create/edit channel popup
3. Connect the channel permissions to backend
4. Cleaning unneeded emojiPopup
- header buttions/title/subtitle simplified
- no need to use states
- no need to use internal `d` object to pass data between pages
- permissions list scroll position preserved when navigation back from
other views
- storybook: allow "back" navigation to cover whole flow in sb
- fix some regressions in permissions-related pages