Ability to remove a team member

[neSpecc]

Right now we can't remove inactive team members.

1. Add a Button with IconEtcVertical right after Role Selector
2. Add Popover with ContextMenu inside
3. Should be visible only for those who has "Write" role
4. Context Menu should have "Remove" button
5. Confirmation is required before actual removing.
6. Implement team member removing on API side.
7. Team list should be updated after remove