[FEATURE REQUEST] Bookmarks of Calculations

**Is your feature request related to a problem? Please describe.**
I want bookmark specific calculations and set them name, so I cant find them easier in future. Even after deleting history.

**Describe the solution you'd like**
Another tab next to History.
Sorting by age of calculations like in history should be enough. (it would be sorted by date of bookmark creation)
On/off switch in settings.
It should be independent on History. (another collection in memory, so if you delete history, bookmarks stay)
I think bookmarking already done calculations in history si enough.
And bookmark them by pressing them maybe? Idk about this part.
And then ok/cancel window for settings name?

What do you think? Do you have some ideas for better implementation?