Summary:
The renaming is to clarify that the operation is more of a schema change, than
a data update. In particular, this is to reduce confusion why it is allowed to
anyone having Structure permission in Access Rules.
The resetting of type is a separate but related cleanup. Changing type to Any
returns the column to initial state, letting it guess type from new data, and
making it easy to enter a formula. It applies also to the "Clear and reset"
option in the Creator Panel.
Test Plan: Updated tests, added a check for type changing to Any.
Reviewers: jarek
Reviewed By: jarek
Differential Revision: https://phab.getgrist.com/D3685
