[Calendar] Make selection behavior work same as AirBnb calendar

### Issue type

**I'm submitting a ...** (check one with "x")

* [x] bug report
* [ ] feature request

### Issue description

**Current behavior:**
Currently calendar selection behavior works really simple, where 3rd click on date clears the selection.

**Expected behavior:**
Calendar should work in the same way as AirBnb calendar works.

**Steps to reproduce:**

**Related code:**

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### Other information:

**npm, node, OS, Browser**
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**Angular, Nebular**
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