Now that support has been removed, all lingering use cases are renamed.
This commit deals with the fallout of the previous change by making tuples structs have public fields where necessary (now that the fields are private by default).
Closes #6738 Closes #7061 Closes #7899 Closes #9719 Closes #10028 Closes #10228 Closes #10401 Closes #11192 Closes #11508 Closes #11529 Closes #11873 Closes #11925