Exporting works pretty well, but importing is rough (mostly because error messaging isn't quite in place, and it's not obvious that you have to close the window to execute the import). I found a generic json serializer, decided to adapt it to WoW, and it seems to work.
But anyway, I saw this code sitting around and figured it wouldn't take too much work to get it in working order. I was mostly right.
Briefly fought a training dummy with a Death Knight and a Shaman. I'm sure stuff like Slice-and-dice will need attention for talents moving around and such.
This has been tested on Classic with a Rogue up to level 5 using various modules and casually checked against a few level 1 classes. I'm sure there's a lot more to do here. I also made sure to test on Live.
Where possible I tried to check for API availability rather than specific client versions or program IDs. There are many cases where that's impractical, however, so version/program ID checks were used.
This was tested with:
* Ace3 @r1225
* AceGUI-3.0-SharedMediaWidgets @r61
* LibDBIcon-1.0 @v8.2.0
* LibDogTag-3.0 @v80200.1
* LibDogTag-Unit-3.0 @v80200.1-2-g93a898d-alpha
* LibRangeCheck-2.0 @v4.2.3 (with a couple of local changes)
* LibSharedMedia-3.0 @r113-alpha