Nodebb: Ability to see which category a topic has been moved from

[mtaki14]

As described in the title I think there should be a way, for mods especially, to be able to tell where a moved topic has been moved from. Having access to this type of history tracking would aid in general moderating organization.

[barisusakli]

The moved icon tooltip will show the old category for admins and mods. The api also has the oldCategory object which themes can use to display custom messages if they want.