Remove tcl
This removes support for Tcl wrapping. I also updated comments which referenced Tcl wrapping to not do so. There seem to be methods which were added "for Tcl", but may really be "for wrapping" in general. It may be worth investigating the actual status of those methods in the future.
Requires !3582 (merged).
Cc: @brad.king @utkarsh.ayachit @demarle @dgobbi @berkgeveci @lorensen