Add order reviews

Add the ability to create reviews on users or completed orders.

### Implementation
- [ ] Rename "Hide" button to "Not interested" on another's orders.
- [x] Don't show links to the authors of orders in order book.
- [ ] When user asks for a full order from order book, bot remembers that and notifies about the last asked order 3 days later, asking if the trade was completed.
- [ ] When user presses "Not interested" button, bot forgets that users asked for this order.
- [ ] After the user confirms that the trade was completed, he can review the order.
- [ ] If both users confirm that the trade was completed, their reviews count as more valuable.