Support the copy/pasting of class-specific properties in the Inspector

[RugbugRedfern]

Currently, properties in the inspector can be copied with Right Click > Copy Value, and pasted onto a separate property with Right Click > Paste Value

There is also an option to copy/paste all properties on a node with the wrench button.

These are useful, however often I will have a situation where I want to copy all the properties related to a single class between nodes, and not the other classes on the node. For example, moving a script from one node to another, without also copying its position/rotation. In these situations what would be useful is a Right Click > Copy Properties on the class header itself, like so:

This would copy all properties related to the class, and allow you to paste them onto the same class on other nodes. This would make it easier to transfer properties from the same class between nodes, without copying all other irrelevant properties in the process.