Chatter patched for Dragonflight

I fixed the errors I ran into after the DF pre-patch for my own use, because I wasn’t sure if this addon would be updated. I’m uploading my version just so anyone else who wants Chatter for DF’s launch can have it.

I’ll take it down if/when the people in charge of the addon update, hopefully I’m not stepping on any toes.

note: as well as the DF errors, I fixed the alt linking feature which was broken since 9.5.2, so if you used to use alt linking you can turn it back on.

note 2: all-edge resizing and movement only works for new chat windows, but I did unlock the main chat window from the screen so I could move it to the screen edge in Edit Mode.