Clientcentral

Feat

- **ClienCentral**: Reuse Roles and Users managers for efficiency.

Feat

- **ClientCentral**: Added function to get role by name.

Fix

- **UsersManager**: Forgot to commit new sub module.

Feat

- **UsersManager**: Started implementing users implementation. Currently only get_user_by_id is func

BREAKING CHANGE

- Priority is now always required when creating a new ticket.

Fix

- **ticket**: Default parameters in wrong order.
- **Ticket**: Force specifying priorty as it can change between accounts.

Fix

- **Ticket.comment**: Explicitly set the visible_to_customer field.