UI: Harmonized copy-pasting and duplication

Blender is not behaving like most of the other, creation softwares and OS. Most of them offer a useful, standardized, way of copy-pasting and duplicating elements.

Current status: every object parameter is individual.

Solution: allow copy-pasting of multiple parameters rows (or groups like "location") at the same time.

Current status: when a scene object gets copy-pasted, its material gets duplicated too.

Solution: not duplicating all object properties; a duplicated object should have the same properties as its twin, not a new, duplicated, full set of properties.

Materials are to be duplicated separately, afterwards, if needed only.

The "duplicate" (CMD-D) shortcut could be implemented.

Current status: I'm selecting an object inside a null object, (let's call it a "group"). I want to duplicate only this one child. Why does it duplicate the whole group, the parent as well?

Solution: the duplicated child should stay in the same parent.

Bonus: the grouping of elements (currently through null objects and collections) could be harmonized. Have a look at Figma's grouping function for example.